Brake lever advice converting CX drop bars to flat

due to ongoing neck and back problems, I am looking to convert my Revolution Cross Race to flatbar.
I'm ok with which shifters to buy, however, not sure which brake levers I need to match the Hope CX manual disk brakes from a pull length perspective.
I know there are many of you out there who are gurus and... may be able to advise?

Cheers
Tony
 

GrumpyGregry

Here for rides.
Shimano Tiagra Flat Bar levers like these

and you can get flat bar shifters/levers combined.
 
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