It wasn't last ditch. Like I said before it was from the General der flieger or whatever the exact name was, Adolf Galland, at first on his own and later with consensus of whole top Luftwaffe brass, that campaigned and finally got it, going so far as to bounce the idea off Hitler to accelerate production. This conversion is as last ditch as anything in that period - BK5 and MK103 e.g.
It'd be like saying BK5 or MK103 were last ditch because, for some totally off-chance reason in an alternative universe that made that other reality barely different from WWII as we know it, BK5/MK103 never made it to production beyond something like 50 units before 410 production wound down.
I don't have any numbers yet that could help Pyro. For anyone else curious in general non-modeling terms I can say it changes power/weight and weight/wing-area figures up to P-38 level instead of barely different (P/W) or worse (W/A) from the 110G.
Top level speed would probably not change, but Powerloading goes up to P38 and P47M level and Wingloading goes to MossieVI/Me110/A20/Ta152/47N level. These are all measured with fuel/ammo for 20min and about 10 kills worth (incl spare ammo for stray bullets IE more 50cal rounds to waste than 30mm's).