Nextjs is most likely going to be the new Ruby on Rails. javascript all the way down, static rendering, PWA, server side rendering...everything baked in. This is a big backing for Next. However rebranding to Vercel is bad.
That's the objective of Blitz.js [1]: build on top of Next.js for a rails-like experience, but made by an independent open-source community. [1] https://blitzjs.com/ - https://github.com/blitz-js/blitz
One suggestion - I highly recommend you mention that you're leveraging nextjs. There is a certain buy-in that nextjs has that would be hard elsewhere.
In fact I would say that I would totally pay an annual subscription for this (even on "starter marketplaces" like themeforest).