Most Greeer people can tell the difference between a G gun and a FP pretty quickly and from a distance. The actions, while somewhat similar, have different shapes and the barrel lumps are very different.
If the price is right on the FH70, and you dont want to have the ejectors repaired (due to cost, etc), take the springs out and make it an extractor gun. Shouldnt jack with the action functioning correctly at all.
Top tang safeties on FP, Gs and even Ds are pretty rare in the Greener world. Usually a very special order item.