release a mir3 server that coincides with this one and then later combine them to make mir4
I played around with this Idea 2 or so years ago (very early days of my C# testing).
In the end it would have been a catastrophic flop.
A: You cannot just simply add Mir 3 Characters / Skills / Images, You need to actually build Mir 3 with Mir 3 Interface. (Solvable; massive work)
B: You cannot use Mir 2 Engine because Mir 3 feels significantly different to play, You cannot change this because that is part of the Mir 3 feel. (Solvable; massive work)
C: You cannot have Mir 3 play style with Mir 2 because the Balance would be so far out Mir 2 characters would stand literally no chance, (Dragon Repulsion anyone)? (Impossible to Solve because of D)
D: Lets just say you did manage to Balance and they were on an "even footing", You would have broken the Mir 3 feel by significantly reducing the stats.
If it wasn't for the balancing issue I would have continued with the project 2+ years ago and It's why I release what is not know as Crystal Files (I took the Mir 3 stuff out).
What you are left with is a Half baked imitation of Mir 3, all that work for such a little chance of bringing in the Mir 3 players, just isn't worth pursuing.