Hmm.

I don't know how the laws work where you are. I would wager a guess that if they want to pull data out of the ECU that would be done specifically based on model year since OBD2 was implemented across the board in 1996. If you convert an OBD2 car back to OBD1 then they're still probably going to want to scan the ECU. If you don't have the right ECU they won't be able to scan it and they might fail you..

The cost of getting an OBD1 ECU, a conversion harness and the Hondata conversion is a bit much. For an n/a application you could do fine with a V-AFC and then your OBD2 ECU is still intact if it does in fact need to be scanned or something for emissions testing.