I agree that drilling holes may weaken the thin swing arm.
I would go to Guat. City and find the very best Alu welder you can lay hands on. They are there ... just got to dig them out. You want a super star.
Let the expert welder decide exactly how to proceed ... but my vote would be to do a very delicate bead build up on the crack ... then weld an Alu plate over everything.
Do the job with the Wheel FIRMLY bolted ON the bike. This will hold swingarm in perfect alignment.
Remove tire from wheel, remove brake lines, remove ALL elec., especially your ECU brain. Cover other vulnerable bits with Wet rags. Should be fine if the welder knows his stuff. The swing arm walls are thin ... so must be done carefully and artistically.
Good luck!
This guy had his KLR welded back together in Baja, rode bike back to USA, replaced frame! Headed South again! It was a crude job ... but got him
1500 miles home.
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