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Could you use a medium-sized g-clamp? Bit easier to get hold of but don't want to suggest this kind of thing for a job I've never had to tackle.
https://www.screwfix.com/p/forge-steel-g-clamp-150mm/6624c -
Is this something I can bodge at home
It's your excuse to invest in a vice. I paid a fiver for a crappy Chinese vice very much like this more than 30 years ago and it's still going strong.
Just got a Quarq Sram power meter. If I’m reading the manual right I have to clamp the hidden bolt in to the chainring with a vice?!
Is this something I can bodge at home or?