It seems they don't want to use a aby box and wants to know how to do it with just the Helix, I guess they also has a very nice interface which they wants to continue using.
The easiest thing to do is just use a send block at the beginning of any patch you want to use, this sends the signal to send 1 which is a 1/4 on the back of the helix and has a dry though which goes on the the rest of the patch, The wet output will send come out of the normal output you have set up. Should make very little difference to dsp usage and quick to add to any patch the send can also to moved to any where in the chain you want it..