I have a Pentax 6x7 and also a Pentax 645 - lenses for the 645 are good value and the 645 is a great camera and not that pricy.
I process my own colour and BW, and have a ton of (mostly expired) film - probably will pass some on to my kids to be honest
I would also be prepared to pay for some upkeep and maintainance - my 6x7 was 'near mint' when I got it from Japan, but quickly developed a sticky shutter - not a hard problem to fix (mostly just cleaning internal contacts) but unless you like DIY you can expect some ongoing costs for repair.
I also have a large format camera - an Intrepid 4x5
https://intrepidcamera.co.uk/product...pid-4x5-camera