Assuming the additional bracket is critical (I noticed one of your earlier layouts didn't have one), why not use a pair of right angle brackets instead?
The bracket comes optionally only on some FlexATX psus, so it is not critical. But the choice of making Hutzy XS compatible had no downside, it was an easy decision
Note that the orientation in which the top cover comes off has no standard. For example, if you look at @iFreilicht's photoshoot of the FSP500 here, you notice the FSP500's top cover comes off on the opposite side of the FSP400
In that case, if someone had the FSP500 and wanted to perform the same mod as you did on your FSP400, they would have the correct orientation for Hutzy XS. So the only way to accommodate the "remove top cover" mod for all FlexATX would be to make the back cutout allow both orientations like the Freilite Brevis S.
Which, sadly, I can't do for Hutzy XS, because the material around that area is also quite critical to the structural integrity of the piece.
Edit:
Having said all that to justify the orientation, it might be in vain. Because one of the problems with manufacturing right now is that the opening of the power connector is too close to the bend, causing that bend to fail. So I might have to rotate the power supply around to move the connector cutout higher into the surface, away from the bend.
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