Gluing aluminium is a pain, but it can be done. Surface prep is critical - fine wet n dry to remove the oxide layer and key the surface, wash off with plenty of water, wipe down with isopropyl alcohol, and glue immediately.
As for the glue itself, Araldite 2015 is ideal BUT it is expensive and comes in a 200mL syringe. I haven't used it to bond to timber, but I don't foresee a problem. If you want to use something more easily available I'd try garden variety Araldite (or any other 2-part epoxy) but I don't think it will stand up to the punishment. Make a test piece in either case.
As suggested, another piece of timber will be a whole lot easier, but if you want to try aluminium then go for it!
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