Personally, I think #724 is a crappy request for a contrived usage case whose graveness is completely exaggerated and overhyped.
Oh noes, THE CAMEOS ARE OUT OF ORDER!!!
We're all gonna die!!
Has it occurred to you that your "right order" is based on a situation that is no longer given once you acquire other technology, either by mod or by enemy ConYard?
the "right order" if the mod removes the Grizzly and replaces it with two different tanks?
All this "correct order" bullcrap is trying to apply one particular order of cameos which is only valid in one particular scenario (unmodded game, unchanged tech tree) to all scenarios that could possibly be, no matter if that makes sense or not. It's bullshit, unneeded, only useful to pedantic control freaks, and will very most likely lead to player complains.
But whatever. If you want it that badly...
The claim that #360 can be done once straight projectiles are possible is completely bogus.
If you just give the bullets a projectile, not only will you destroy the instant-ness of the bullets, but you'll end up with Cannon Fodder-like bullet effects, rather than proper tracers.
The effects you could possibly fake would be worlds inferior to a live-computed version.
I do think #360 is far more important than #322, since it would be this kind of eye candy that sucks in new users, but since ICS gives #360 as many opponents as #322 has supporters, I guess it must die.