Hi FBL,
Have you made more progress? I'm the guy that did the FTP video above and I've recently started using MG2 on iOS. I really think it offers better tracking than my FTP and no need for a pickup. With the Helix routing, it works very well. I have the MG2 input set to USB7, which is the reamp channel on Helix so it takes the raw input guitar signal and no extra path is needed. I then have a separate path for synth coming back into Helix on USB3. Its great being able to just use a USB cable and Apple CCK. If you're interested I can post a picture of the Helix path.