For the chrome areas I use simichrome polish, works good.
I also use simichrome polish for the non-chrome areas that I can reach.
Problem is, there are a number of nooks and crannies that are hard to reach and that's what takes up the bulk of my time.

If it were my pickup (that I painted flat black) that would be no problem since I can just shoot the rusted area with the rust reformer spray.
This spray only comes in flat black.

Is there a version of this that is "colorless" that I can just point and spray? That would save me gobs of time.
Assuming not, based on my initial searching, maybe the alternate question is "what's the most efficient method you've found to get rid of rust in a number of hard to reach places (where you wouldn't want flat black spray to end up painting the surrounding parts)?"

 

There are rust converters that are more a brush on liquid and not a paint. They are intended to be brushed on to convert the rust then the painting is done as a separate step. Another option is to use a rust preventing oil like Boeshield T9.

 

I found naval jelly works well

 

Navel Jelly is a rust dissolve so when it's done it's job you have bare metal that needs to be treated/coated or the rust quickly comes back.

The converter that you show, which I have not seen in aersol form, converts and technically self protects.

A great brush on version is called Rust Mort, have been using for 25 years!

 

Home Depot didn't have it or anything similar.
The local Auto Paint store recommended Mar-Hyde.
Supposed to turn the surface black but when I applied it it came out as a creamy colour.
I'll give it some time to see how good a job it did.