Mark, as you have good access inside where you cut off the bearing holder, you could weld a length of flat bar in there then drill holes in both the insert piece and the original RHS and plug weld them with the MIG.
You could even do that on the 3 sides (maybe angle iron for 2 sides) where you have access for plug welding. If you then weld that insert piece in place and flapdisk it all it will look original and much cleaner than external angle iron added on.
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