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Yeah, that's what I meant by chiselling it out.
You can also get multi cutters with depth stops.
You could make a guide for a router but you're not going to be able to get it close enough to the frame.
Easiest way would probably be oscillating tool to make the plunge cuts, then chisel the material out. You wouldn't have to make it full depth, as any strip that protrudes above the floor level can be sanded or planed flush.
I would say that it will be tricky tho. Deffo give it some practise on some scraps.
Having pondered a bit on my flooring repairs, is there a tool that does something like this? Part depth cut adjacent to a vertical wall or similar. Guided plunge router? @nefarious I assume this is what you meant in terms of chiseling it out?
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