I am pretty sure you can still get the firewall from Toyota to do the conversion but that will cost A LOT to ship. Also a lot of work to remove the RHD firewall and fit the LHD one.
What Cold Taco did is probably the easiest way to do it.
Cheers
You can buy brand new HZJ79 DC off the Toyota lot in CR. I believe VDJ79’s are available as well but are imported from the Middle East. All the cops in CR use 70-series (76/78/79).
Cheers