I tend to use same structure (in html) and use css for making it brand specific. I built something that makes this easier for me, basically it takes a couple minutes to set something up with a lor of things prestyled.

What I am suggesting, I guess, is use some similar approach for you sue cases. Craft one, or pick one, see if ou can reuse the structure then reconfigure the branding part with some css lib (maybe pico? https://picocss.com)