I have done some thinking!

As far as the previous census goes for the empyrean path to walk of echoes path comparison:

Verethragna 3,177 | Revenant Fists 2,766
Twashtar 1,238 | Daka 1,293
Almace 2,285 | Badelaire 747
Caladbolg 720 | Espafut 477
Farsha 433 | Alard's Axe 141
Ukonvasara 1,910 | Maschu 1,469
Redemption 283 | Penitence 457
Rhongomiant 314 | Cerastes 212
Kannagi 5,173 | Tobi 1,822
Masamune 2,894 | Hiradennotachi 1,350
Gambanteinn 420 | Canne de Combat 348
Hvergelmir 205 | Taiaha 56
Gandiva 933 | Harrier 653
Armageddon 648 | Bedlam 342
Daurdabla* 103 | N/A
Ochain* 498 | N/A
Total 21,234 | Total: 11,599
*Only counted the Lv.85 and Lv.90 versions as I was unsure if just the bought shield and harp counted toward the amount.

This data states that there is 1.83x the amount of empyreans than walk of echoes weapons. The totals are from quite a long time ago and I'm assuming is a much larger gap between the the two classes of weapons due to the easing of farming the key items to pop the monsters.

Now, Why shouldn't it be so that walk of echoes path outnumber empyrean at least 2:1 or 3:1? It may be too late to fix that now, but it can still be altered to help some if the system were to get another major overhaul.
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First, for my idea to work, a sixth coin would have to be added as well as a walk of echoes path for a shield and a harp. Possibly do something like:
Shield -> Utilis Shield (Augmented) DEF+7 for first trial [30 of sixth coin]
DEF: 15 for second trial [Kindred's Crest x20]
DEF: 25 for Lv.90 trial [High Kindred's Crest x50]
DEF: 30 Converts 20% of damage taken to MP upon successful block for the Lv.95 [Devious Die x100] (keep it as a size 3 kite shield for block rate and block absorption)
DEF: 35 Converts 25% of damage taken to MP upon successful block for the Lv.99 [Liminal Residue x100] (possibly give this Lv.99 version of the shield like an Aegis type block rate and block absorption?)

Harp -> Pyf Harp (Augmented) String skill +2 for the first trial [30 of sixth coin]
String skill +5 for second trial [Kindred's Crest x20]
String skill +5 Singing skill +5 for the Lv.90 trial [High Kindred's Crest x50]
String skill +7 Singing skill +7 for the Lv.95 trial [Devious Die x100]
String skill +10 Singing skill +10 Grants an additional song effect for the Lv.99 trial [Liminal Residue x100]
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Now that there would be six types of coins, have Veridical Conflux 1-6 each be assigned one of the six coins to drop so that people can know what they are going after when they enter the battlefield. The next step would be to increase the coin supply to a point where people can obtain the level 90 version of the weapons relatively easily with any old pickup group of however many they may need to complete the battlefield.

Change the box system to yield two types of chests, a gold pyxis and brown pyxis. Should a player select a gold pyxis they will not be able to receive coins, but are guaranteed at least one piece of equipment from that conflux as an incentive for players who do not need coins to do the event anyway. Should a player select a brown pyxis, they guarantee themselves at least one pouch of the coins assigned to that conflux. Have Veridical Conflux 7 be a wildcard where you are guaranteed at least one pouch in your chest, but it is random.

Now for Veridical Conflux 8 through Veridical Conflux 15, add a box for Devious Dice that would yield between 3 and 10 or something and place them in the brown pyxis in confluxes 8 through 11. The same can be applied to Liminal Residue for confluxes 12 through 15. To add even more of an incentive for players to participate in these higher tier confluxes, add conflux specific rare/ex equipment WORTH GOING TO DO THE EVENT FOR so that players can not simply say "somebody else will do it, I'll buy it on the auction house when it gets there." If players go to do walk of echoes to obtain equipment they cannot get anywhere else, people that are working on their weapons will also go and actually progress beyond the level 90 version.

For all fluxes: upon not completing the objective within the time limit, the monsters will despawn and only the brown chests will appear for a chance to obtain single coins(1-7), dice(8-11), residue(12-15) depending on completion percent. For example 0-33% may yield a 50% chance of one coin/die/residue, 34-66% 100% chance of one coin/die/residue, 67-99% 100% chance of one coin/die/residue and a 50% chance of a second.