You need to check first if the software needed to connect to the mini-pc (like desktop remote, etc) can run on the iPad in question.
also, Remote Desktop needs windows professional (I had to upgrade my laptop) and can connect remotely with my iPad Pro. An earlier version of iPad doesn’t run the Software. Once it works, you don’t need an extra keyboard or monitor. All goes through the iPad.
If you are using WINDOWS REMOTE, that needs windows pro. Any other utility works fine. UVNC, RealVNC, TightVNC, all free, then there is the pay versions.
Don't use tools that require internet, you may want to take this to the site, and remote in directly.
For that I love a portable router, or use the MiniPC under windows 10, as a hotspot and connect directly with that Which is a nice freebie.
If it runs on windows, it will most likely run on a windows miniPC.
Clear Skies !