I want to make sure I understand Lets assume I am in US and have a british bond Forward hedge = Simple just use a $/L FRA Proxy hedge = Use a hedge with a let say US/CDN assuming CDN is correlated with L Cross hedge = use a CDN/L thereby eliminating the L currency risk and transferring it to CDN
i don´t know which tickers you are using, but sounds like ok 
usd gbp = fwd hedge usd cdn = proxy hedge cdn gbp = cross hedge