I've updated the OP with more detailed instructions regarding left-hand Shift. Please state whether you (A) are fine with regular ANSI 2.25x left Shift, (B) must have ISO left Shift to participate, or (C) would prefer ISO left Shift but will still participate without it (or (D) some other combination of need/want).
I don't think I've seen anyone asking for anything other than regular 1.25x Ctrl/Alt/Win, which is good.