Seems to me a TIG Aluminum Spot weld would be easy...
Or... since you've drilled it... stopping the crack from traveling...
"Bondo" is a very good choice... it flexes , Bonds to Aluminum very good...
Your only using a tiny dab... It's a better choice than 5 min epoxy...
Just give it a slight dimple... and make sure a little pushes thru the hole...
I've even fixed Car and Heavy Equipment RADIATORS with Bondo...
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YMMV..... Just "MI TOO SENSE"
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Gotta Fly...
JAM
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Buttercup - STOL - Aircraft
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"Buttercup" Building Log
Buttercup in EAA Article
Sometimes you just have to take the leap and build your wings on the way down...