It took a while to decide, but now it's running, Wagtail a Django-based CMS framework.
My main issue for not doing it earlier was that I needed to keep the /ip/ from the old site. This obviously wasn't on Tumblr, but on the no-www part of the site. A little PHP-script.
In Django it is also pretty simple.
I'll show how once I get code-snippets working 🤔