I wouldn’t do that, nor use fuses not recommended by he factory. But if you must, why not add a crowbar circuit just for insurance?
Doesn’t have to be exotic: just a twisted pair of 20 AWG insulated wire with heat shrink to insulate each end. Connect one wire to the hot side of the AC inlet and one wire to the common side. Arrange the wire across the top of the chassis so that in event of fire the insulation melts and the two conductors meet and blow a breaker.
Crude, but better than nothing. I use fuses, breakers, and crowbars. YMMV