I'm thinking of pursuing a career in martial arts.

[Aegon]

I am a natural-born powerlifter with years of training under my belt and I think I can be a decent "Judoka", which is the term for a Judo practitioner.

Not entirely sure how much a powerlifting background will help with judo, other than the fact that you might just be used to strenuous exercise. But regardless, sure, go learn judo. I think considering it as a potential career before you even start is maybe a bit much, just start as a hobby and go from there.