I’ve serviced my floats a few times now. It is very straight forward. I’ve also cut down the piston rod for the air chamber. I’ve travel adjusted a set of Van 140s for a mate (bit of spring maths went into that one). They’re all really straight forward and the seals are common. I think BETD do the enduro stuff in the UK and CRC might have some kits.
I think the float fluid and fox oil are rebadged Torco products so would be cheaper from a motorbike shop. There’s a chap called peter Ver Done with a web page that compares pretty much all the fork oils out there so you can find something similar if not the same. Just take your time really, don’t rush it.