Yep. I'd be tempted to use some Alumiweld rods on those cracks.
Propane torch, stainless steel brush, and Alumiweld rods.
Alumiweld rods are really brazing rods for aluminum, not true fusion welding. However, a brazed joint is much stronger than what is needed for this crack.
I'm leery of MAPP on an aluminum part this thin. Even propane can easily melt the aluminum and requires care.
IF I were going to fusion weld it, I'd see if it can be TIG welded.
With it being in a non-stressed area, probably not worth the expense of TIG, and with the metal being so thin in that spot.....

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What would Jim Cirillo do?