Another person also suggested using the vinyl tubing all the way. I have 2 issues with that, which maybe you can help dispel.
1. Routing is a pain, I can't really route the tubing where I want it. If I try to bend it, it may actually fold or kink.
2. Integrity and security. I've seen threads on here of people coming home to flooded rooms because the vinyl tubing slipped off.
If you can ease these 2 fears then I may go vinyl all the way.
My neighbor, who works for Ken Marine, says he uses vinyl tubing for return lines in all of his installations. So I know people do it, even professional, it just scares me. Glues PVC give me that warm and fuzzy feeling that I know it will never leak. Although conversly it amplifies all vibrations and noises.
Let me know if I should make the switch. I have plenty of 3/4" vinyl tubing.
Thanks
Josh