In savage content I could imagine u not getting far with RDM in its current state, a lot of PFs will block RDM accessing their parties as they considered a very weak job.

And if your not intending to play a second caster role this could hinder you overall.

I’d personally go Dancer / machinist and here’s why:

They share armour, this will make it very easy to keep them geared jointly. You can farm these pieces and keep each geared automatically by simply upgrading one

This will give you the most flexibility in choice of your choices, these two sharing armour will make it much easier on you long run. Compared to mixing casters and ranged physical.

Most will pick a role and level all 3 in that role because of this. (Not saying you need to)