I'd just cut and resolder the injector plugs - I wouldn't do a whole new harness and repin everything else just for the injector wires. But that's me. You can also shave the obd1 injectors so the obd0 plugs fit and click onto them.

 

If you don't want to cut anything on the original harness you can look around online and see if you can get a obd0 to obd1 injector conversion harness (I had these for my old EM1 when I went with grams injectors, I got a conversion harness to go from my stock wiring to the EV6? plugs required for that style injector), keeps it all plug and play, you can also do as stated above and shave the injectors to fit, I have done this before and it works just fine.

I pretty sure you can also depin the obd0-obd2 injector clips and just swap over the "shell" of the plug. However I haven't tried this, but I a pretty sure I read a thread somewhere that was a write up on doing that.