You can install Kitsu on your own server, it’s opensource software. They offer services for hosting and so you don’t have to install the server yourself. But I’m pretty sure you can setup your own instance for free.
You’ll definitely need a bit of help here especially if you want to do something else than setting up the pipeline (or have a life).
The good thing about openpype is that a lot of the things are already done for you, even if I’m sure you’ll still need a full time python / IT developer to make everything works.
Unless you build your own solution from scratch all that you’ll find are stuff that are cool but that probably won’t fit 100% your needs.