Superglues for higher heat applications?
You are either going to use glue which has melting points - I can't believe that there are no glues that can't handle computer heat - or caulk/silicone which may handle heat better but has some elasticity to it so it may move or have issues too.

Really best options are epoxy or weld it.  If you don't want either of those than you have to choose the one of the two above that you can live with.