It appears you've covered off most of the electrical side
2 suggestions, physically change injectors 1 & 4 over, they are just held in by the rail onto rubber grommets (I think) little while since I did 4AGE, my last MR2 MK1 had a V6 fitted.
You also need to consider either a compression or leakdown test across all four, just in case it's dropped a valve or damaged a piston, unusual on this engine but you never know.
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