If you have a good welder, then have it welded up, add reinforcements (on both sides) and reinstall.

However, while that motor is out, I'd replace all the pesky seals/gaskets/etc. You know if you don't that oil gasket behind the alternator will leak the first day you get the X5 back.

__________________
Kirk
Las Vegas
2016 X5 40e Mineral White/Black Dakota Leather, ZLL, ZCW, ZDA, ZDB, ZPP, multi contour seats, rear side window shades, HK stereo
2011 E90M3, 6-speed manual