Could I buy an Ibanez Edge pro and put it in a guitar with a LFR/OFR?
All the high-ends Ibanez trems are made in Japan while the TRSs, Edge Pro II and Edge III are mostly Korean product (1st production of Edge Pro II/TRSs/Edge III are from Korea, AFAIK). However, the Edge III/Lo-TRS II is a direct swap for an OFR/Gotoh/Schaller/similar. The Lo-TRS I have smaller trem posts, so you'd need to use the old trem posts if you want to swap it (im not 100% sure 'bout this).

As for "Other LFRs without brand", an OFR/similar should be a direct swap.