So you did all the easiest parts of building one of the best pieces of equipment and think this entails "a ton of work".
Mythics being hard is part of the compromise between casual and hardcore gamers. There's got to be something that takes effort, that people can feel proud of, while still allowing for casual content that less dedicated players can do. Again I ask: you knew what the requirements to get a mythic would be. Why did you go into it?
I know a WHM who has had Yagrush since late 2010. He did all this stuff when defeating the 3 Beastmen kings was difficult, when Salvage, Nyzul, and Assault were not soloable, and when you got like 1/10th the zeni. I coveted the Yagrush but I knew that actually obtaining one was hard. So for a long time I just accepted it as something out of my reach and played my WHM very well with a lot of good equipment that did not include the Yagrush. Eventually, I was fortunate enough to join an active linkshell, and when I surmised that building a mythic might be within my grasp, only then did I do it.
What I did not do was start out with your attitude of "I must have this. I deserve to have this. I will have this." That's just a recipe for disaster.
The system could possibly use some tweaking to make it more viable solo. I wouldn't mind adjusting some of the unsoloable Assaults to scale down, or letting you trade in Copper AMAN Vouchers for 500 Tokens. It shouldn't be easy, but I do think there's room to make it more solo friendly, because of declining server populations and the tendency to make a lot of other stuff more solo friendly.