To be clear, what was asked for is Type 74 variants to boost lineups. That's exactly what's coming here.
Foldering vehicles is not done on request, it's done by economical factors and development decisions when a tree is large enough to begin foldering things. Japan has 3 Rank VI tanks. Folders only start appearing when a rank is reaching its limits.
Naturally people are always going to want the quickest and easiest path to get something. But reaching the top of the Japanese tree is already possible in 1/3rd of the time of the US one. So you shouldn't expect to see many folders anytime soon.