Interesting idea, but the 2U Enter, 2U Control, 3U RShift, and 4U space bar are going to be a serious challenge to find keycaps for.
One possible "fix" I've seen used elsewhere is to keep the center ortholinear and let non-1U caps overhang -- so LShift and Enter would have 0.25U sticking out. You can ditch the macro keys (I assume?) and use regular Tab and Caps, as well. For the bottom row mods, 1U versions are the more common, though you may want to consider the 1.5U versions paired.
We have done the layout you mentioned before.

This layout paired with keycaps is very convenient, but the appearance is still slightly unsatisfactory. Therefore, we have introduced this new layout to meet the public's aesthetic standards
As for the keycaps, there's no need to worry. We will specially customize molds to produce keycaps of this non-standard length.
Thank you for your advice。Please follow our latest progress。