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With time and lots of money anything can be done.... Is it worth it? No......if you have a JDM RX-7 just sell it and get the left hand drive you want ....
Might ironically take a chunk out of the value as a JDM-market car. It will most certainly be worth less at re-sale, if only because buyers will be afraid the conversion compromises the car - or might down the road in their ownership. That said, if later FBs are like SAs, all the mount points and read-to-drill-out holes (eg thru firewall), etc were all on the body shells for either L/RHD.
Turbo/injected harness would need to stay, which would make re-configuring the dash wiring over the other side of the car...challenging. But doable.
Good luck!!
Cool car either way...