Rough 98K, what to do with it?

[WarPig1976]

What are the best ways to remove/ arrest the rust?

In this case there are only two viable options, Electrolysis or boiling to turn the rust into black oxide. Won't remove blueing and will kill rust in every nook and cranny. Personally I'd go with Electrolysis because there is no doubt all the rust is dead. There's more "moving parts" to a setup but worth gathering and having on hand anyway.