As I was drawing up that diagram I was wondering if that approach might work. Of course the alignment is really critical ... perhaps you are cutting them in when the panels are already taped together but flat. yes that would work as long as you can get the chips out of the joint ... excellent suggestion. Do you have a trick for getting the Lamello perpendicular to the joint? Also, assuming you insert the biscuit after the fold and just chisel or cut the excess?
Apologies to Andrew ... when I re-read his post that approach (in my diagram) was exactly what he was talking about. Prashun, great suggestion on the sandpaper. Took me a bit to envision where you were suggesting but now it makes sense.