Register with CB?

-- HikaShop version -- : 2.6.3
-- Joomla version -- : 3.6.5
-- PHP version -- : 7.x
-- Browser(s) name and version -- : various
-- Error-message(debug-mod must be tuned on) -- : none

We use Community Builder for our J! registration.

Is there any way to force HS registration process (in the checkout) to use the CB registration form - either in an 'iframe' type solution or to just redirect over to CB to register, then return to the checkout process after registered?

The main thing is that we have a couple CB required fields that we use in setting some discounts and would like to have those applied during the checkout process.

Presently the registration works, but doesn't gather those CB required fields - so we aren't able to apply specific discounts.