Note please that "proper fasteners" includes replacing most lock washers, lock tabs, nyloc nuts and safety wire.
IMO, Loctite is a suitable substitute (in most cases) for all those items; but of course since Triumph did not originally specify it's use, you are undertaking modifications of safety-critical items. I don't use it on suspension fasteners (instead I buy lockwashers & Nylocs in bulk
); but do use it in some other places, with due consideration to future disassembly.
I'm told that, after due consideration, my employer has nearly eliminated use of all other threadlocking devices and now uses Loctite in most places. Not to brag, but they might just know a few things about tractor engines ...