Cleat replacement

My cleat pulled out. Doesnt appear to have a backer block. Glass is in good shape other than minor spider cracks in gell.
Question...is thixo or marine tex (i have) good enough to squish through the holes and smooth surface with wax paper. Let cure then drill and re screw cleat back down...?
OR
di i need to cut a slot between the two holes and slip this piece of aluminum stock in and turn bow to strengthen and screw stainless screws in pre tapped holes. I really don't want to if its over...

Cleat replacement