As for C4 and Beuchat foot pockets - if you get standard C4 blades, it indeed needs an hour or two of work to adjust them, and the different holes remain a problem. I went through it, and after long hesitation I finally drilled new holes. One of the blades broke about a year and half later. However, C4 will ship you blades for Beuchat foot pockets without problems, so if you like Beuchats (I do), then there is an easier and safer way than adjusting the blades.
I would like to test Effesub's Master PRO Evolution foot pockets - they look absolutely lovely. Just a pity I do not find them in any local shops to try them. The price I found in online stores so far is rather steep (over 70€), and without the possibility to try them I am quite hesitant spending so much
FINS - MASTER PRO EVOLUTION - Effesub