"create polished visual work like designs, prototypes, slides, one-pagers, and more."

I use Opus to generate Typst for that and I'm already pretty happy with that approach. It gives me a degree of control I do not have with other methods, because

1. Typst is really powerful

2. Opus is really good at surgically modifying Typst

I basically never look at the Typst code for this. Telling Opus visually what I want changed is usually good enough.