You can select more than one image at at time in the Links panel, then choose Edit Original from the Edit menu, the Links panel menu, or right-click in the links panel.
However, I am not a believer in converting images to CMYK just for the sake of doing it. Strongly suggest leaving as RGB, as noted here:

Why You Should Import RGB Images Into InDesign and Convert to CMYK On Export

Please see this thread for answers: https://creativepro.com/topic/grep-for-applying-character-style-to-phrase-between/

Oh! That’s a good clue… didn’t think of that. Looks like Lanston is maintained by P22: https://fonts.adobe.com/foundries/lanston-type and https://p22.com/ltc

I’ll reach out to them and see if they have any thoughts on why this may be happening.

That is SO weird. I have never seen a font do that, but I can confirm that the non-breaking space is messed up. It’s not just InDesign… Photoshop and Illustrator both show it wrong.

I think Steve’s idea of a GREP style is perhaps the best. Make a character style that applies around 250 units of tracking, and then use a GREP style to apply it to the character (just type ~S into the field… that’s the code for non-breaking space)