Not OP, but Monumental is a registered sponsor for highly skilled migrants, which is applicable for the roles listed. So in short, if you got an offer you could be sponsored.
That's the UK in a nutshell this past decade. Privatise all of the public services for a quick buck, and slowly but surely the service decays whilst the prices for consumers increases. The trains in the UK are a great example of this.
Voron would be my recommendation. It ticks all the boxes of what you need it to do. The only caveat is you need to build it, screw by screw (unless you buy a pre-assembled one such as siboor). It also requires printed parts which can be ordered via Vorons PIF program (high quality, printer-verified parts).
Depending on how easy you find it, it will take at least 10 hours to build. But that is part of the fun.
Software and repairability are there. Spares are cheap and klipper is open source. It can work offline but it works better paired with tailscale. You can upload sliced models OTA.
Slicing models will be the easiest part. I'd recommend the basic orcaSlicer set up for the printer of choice and go from there.
Good luck and have fun. 3D printing has become the most addictive hobby I have ever taken up. Be careful with your time!