There are brakes on ebay. Seller says it can be used for 26'' to 700C conversion. https://www.ebay.com/itm/Taiwan-made-Patent-Alloy-V-Brake-For-20-406-451-26-and-700C-Rim-Red/130659020833?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D1%26asc%3D20131231084308%26meid%3D9e8b948c950848b18b66548e184dd4db%26pid%3D100010%26rk%3D2%26rkt%3D4%26sd%3D251282115326%26itm%3D130659020833&_trksid=p2047675.c100010.m2109
I like you man !!!!
Braking power will be compromised due to the distance where the pad will sit vs the pivot.
Might as well use calipers.
@Gaston started
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There are brakes on ebay. Seller says it can be used for 26'' to 700C conversion.
https://www.ebay.com/itm/Taiwan-made-Patent-Alloy-V-Brake-For-20-406-451-26-and-700C-Rim-Red/130659020833?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D1%26asc%3D20131231084308%26meid%3D9e8b948c950848b18b66548e184dd4db%26pid%3D100010%26rk%3D2%26rkt%3D4%26sd%3D251282115326%26itm%3D130659020833&_trksid=p2047675.c100010.m2109