I have found that warming epoxy before mixing, and curing at 100C or so leads to a fast setting joint that doesn't soften with heat thereafter.
I generally use the bottom aga warming oven. 24hr araldite can be hardened in about 5 mins using a hot air gun, and it goes translucent and dark brown, and is more like bakelite.
I do all my pottery and ceramic repairs with modellers 5 minute and stick that in the oven after wiping off surplus with cellulose thinners.
None's fallen apart in the dishwasher yet.
So try the techniques out on scarp bits first and see. There are a zillion epoxies out there.