The Alexandrite was always the hardest part of the time management test that is Duties, Tasks, and Deeds. I get that you don't have as much of the population doing salvage anymore but then again it is easy enough to just keep spamming Salvage for more alex. Also if we end up being able to augment Salvage gear and need 15/25/35s to break down into tatters you might see a lot of people doing salvage again and with that lower alex prices.
If you have friends/your LS see if they would be willing to do some farm runs and offer to buy the alex off them at a reasonable price.
I do agree that a lot of the mythics aren't as powerful as other options (then again a lot of the mythics weren't too impressive compared to relics at 75), but making them easier to obtain isn't a good fix for that. I was annoyed that they made the T4 ZNM drops 100% as that makes finishing up mythics a lot easier (Tyger can go die with its old trigger drop rate).
With the changes to dynamis, relics are going to become a lot easier to obtain now so if you need a quick/easier trophy piece go for emps or relics. It is nice that (at least for now) something in this game isn't a cakewalk and actually takes some time/effort to obtain, even if the reward isn't exactly the best option in the game.