Mechanically Stripped Frame - How to Paint

[b-mac]

I mechanically stripped my frame via sanding, wire wheels, and a needle scaler (for the tight spots.) It's pretty damn clean, but not perfect. There are plenty of rust pits I'm unable to get to, and tight spots I can't quite reach. That means there's still a little rust in spots.

I'm not sure where to go from here...

POR-15 : Maybe to clean for that. I read it needs rust to stick to.

EW Rust Converter : Same here, I think it needs rust

EW Rust Encapsulator : May be good option. Don't know how it preforms on bare metal. Prime and paint over? What type of primer?

Chassis Saver : Similar to POR-15 I think.

Self-Etching Primer?

Some kind of etching product, followed by epoxy paint?

Maybe even a white vinegar wipe down?

What are your thoughts and opinions on any of these options, or if you have any other suggestions/products that you've had success with.
Thanks for your input.