The only kit that included 1U Ctrl and Alt keys for the bottom row was the 40s kit, which is gone now. It doesn't look like there's any kit that includes support for the bottom row on layouts that use 1U Alt, Fn, Ctrl to the right of the spacebar (Vortex Race 3 75%, Tada68 65%, etc.). It looks like you dropped support for more than just 40% keyboards.