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)

What kind of tools are the users familiar with for such tasks? It’s best to make it look like something the users already know, not something HN tells you is their favorite