Weldong would hold up fine if you're a good welder, the issue you would have is next time you need to drop the cross member it'd be a PITA to remove.
here's my suggestion: Grind off any protruding bolts/studs, weld on a small bar of 1/4" plate with bolts through it (heads welded) & heads ground off so that you have "new studs" and bolt it back on.
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