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in theory I could put a wolf tooth on my zee derailleur and get a 42 tooth cassette to work.
Yep. I'd try and borrow one for testing first, rather than buy it. Longer chain, yeah.
You can still expand the range with a short cage RD just likely not enough for a 42T cassette.
You can buy RD cages separately as Shimano spare parts but for the amount of pissing about I tend to buy new deraillers (that's probably why I have so many spare RDs!)
@hippy thanks lad, so in theory I could put a wolf tooth on my zee derailleur and get a 42 tooth cassette to work. I’d only have to buy a wolf tooth, new cassette and add a few extra chain links. This would definitely be the cheapest option for me I think.
Edit….scratch that just read the zee fr still has a short cage so unfortunately won’t work. I’m so confused 😂