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yes these rotor cranks should work but you will need to add a 10mm( roughly) spacer if using the BB linked.
personnally i would be looking at using a threaded one with spacer integrated, such as this
https://velotechservices.co.uk/shop/vclose2.asp?prd=222774&cat=350
https://www.wiggle.co.uk/rotor-ubb-4630-steel-bottom-bracket?lang=en&curr=GBP&dest=1&sku=5360774760&utm_source=google&utm_term=&utm_campaign=&utm_medium=base&gclid=EAIaIQobChMI4ajk8_mJ8AIV4mDmCh1lkgDmEAQYBSABEgLoA_D_BwE&gclsrc=aw.ds
Thanks a lot for the feedback. I just had a panic that the NOS cranks I ordered (Rotor Flow) wouldn't fit, but Google seems to think otherwise. Apparently they have a 'UBB30' axle that works with everything: https://www.mantel.com/lu/rotor-inpower-flow-mas-power-meter
Seems this is the go-to BB? https://rotorbike.com/catalog/default/rotor/triathlon/bottom-brackets/bbright/press-fit-4630.html
Seems wise to get something second hand off eBay until I know what works - there's a set of the Vuka Alumina base bars/extensions on there at the moment I will go for.
Will keep an eye on on ebay for a seatpost...