RS-422 transceivers can extend SPI trivially. Just add interfaces, and twisted pair cable. Don't ignore ground, everything is still common ground, and still prefer shielded cable for best results. (RS-422 receivers have a generous immunity, so they can tolerate a fair bit of noise via unshielded cable.)
It's not very efficient on wires, but it's very easy to realize. The cables are easy, too -- you can buy 5-pair ribbon cable that's got twisted sections, followed by flat sections where IDC connectors mate as normal.
RS-232 and RS-485, with various protocols (and for 485, bus arbitration), are very common for industrial sensors. CAN bus. Maybe Profinet, haven't heard it much around here but I recall it's broadly similar.
If heavy-weight solutions are okay, there's always Ethernet, and a facility probably has an existing network of it.
For max 2m, I would mind, but accept, I2C on shielded cable. SPI (CMOS level) on shielded cable, with terminations, and maybe added Schmitt trigger receivers, would be a little preferred over that. RS-422 seems a little over-the-top for this range but will be very reliable, even moreso with a shielded cable. I don't think you'd worry about anything else, unless say you've already got a CAN bus in the project so you can just tee onto that.
Tim