My daughters both have really bad eczema and whenever we go on vacation, they are so blotchy! Anywhere their eczema has been in the last year is white and the rest of their skin tans. It's the strangest thing. So yeah, I plan on advising them to just wear sunscreen and embrace the pale because it seems like it would be hard to make a tan work with that skin. I have rosacea and also have to avoid the sun, so we will all be pale together.
Sounds like you really want to try out the tan look though, so maybe start with a gradual tanner like the St. Tropez or NKDSKN ones - these are more like a lotion and give you a decent tan after a few hours that lasts a day or two, but can be built up over time. I think that would be a better place to start if you are worried about it clinging to your dry patches because if it looks crazy, it will wash off a lot faster.
As far as matching your foundation to your tanned skin, have you considered something like the cover FX custom drops? Get it in a few shades darker than your normal complexion and you can mix it with your facial moisturizer, sunscreen, primer or whatever. This seems like it would be the most customizable option to me, you could darken or lighten up your mixture as needed to match the rest of your body.
Another option is the Clarins golden glow booster, which you would put in your normal foundation to make it looks more tan and glowy. I have never tried these personally but one of the youtubers I like (Alison Anderson) raves about it.