RTF is a global modification that replaces all towns in the game.

but again, all units will need to be recalculated

Recalculation will be necessary in any case.

support and defense are not entirely accurate, as attack and alt-attack are already divided into positional units

Then, we can do without "support, attack, defense," but with a colossal difference in the importance of units, while still being at the same level.