Loctite should be fine, if the right grade is used and it's applied properly.
I've rebuilt a few diffs, mostly race cars and we never wired the CWP bolts, only loctited, and they were all fine. The first race car diff I rebuilt was under the guidance of a NASCAR and touring car mechanic (and ex-aircraft mechanic), and he only used loctite, too.
Yes, wiring bolts is still used in critical applications in aircraft, and you can wire the diff bolts if you like, but drilling bolt heads in high tensile bolts is painful (been there, done that, even made a jig to make it easier) and I'd still use loctite instead of wiring because
a. I don't have wire twist pliers
b. I've never been able to do it near as neatly as the blokes I know that work on aircraft

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