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Is there a similar 11 - 30 11 speed MTB cassette I could put on there and would it work with my 105 chain?
Don't think so. I think the smallest Shimano 11 speed MTB cassette is the 11-34 also badged up as an Ultegra cassette.
changing the freehub to one of these will let me run 11 speed 105 cassettes right?
On a Shimano M675 hub? Nope.
You could get a road 11-30 11-speed cassette machined to fit a 10 speed freehub. That may be easiest.
I can never remember the chain / cassette combos.
I have a M675 rear hub. I know it is MTB 10 speed as I've got one of those dinner plate cassettes on right now.
What I'd like to know is - as I know my 105 11 (11-30) doesn't fit on there :
Is there a similar 11 - 30 11 speed MTB cassette I could put on there and would it work with my 105 chain?
This would also answer this question:
Novatec D712SB Hubs - https://thecycleclinic.co.uk/collections/freehub-bodies/products/novatec-freehub-bodies-for-shimano-abg-and-campagnolo-type-b2
changing the freehub to one of these will let me run 11 speed 105 cassettes right?