I was in a simular situation; I live on 20K a year so every purchase is an important one. I conscidered this latest purchase for months, just like you.
A 22lr lets you shoot ALOT! Training, lots of training, is what keeps your shooting skills good.
A 'better' sight might make you shoot 'better' but to not train as much, do to cost of CF ammo, and that is where you loose muscle memory and speed. Yes a 22LR IS different than the REAL THING but hitting a target, sight picture and trigger control is not. As that ash hat that beat out Napolean once said (Sorta) Shoot! Shoot! and Shoot some more!
There will be a replacement for the EOTECH someday, I use a $150.00 Bushnell X1 MP dot scope, dang thing works gud!