I thought about something like that. I was thinking along the lines of using a half piece of 3/4" hardline as an outer sleeve. I kept coming back to the fact that it would be easier to just buy extra fittings and run the tubing differently than try to make something like that. So I wanted to at least try the anti-kink coils since that would be the easiest and cheapest route. And they worked pretty well, I just kept the coils bunched up tight and forced the turn to be long enough not to kink.