That's just what I do, too. I used to use the next spot up on the strap when sitting, but haven't bothered with that for a while.I'd recommend that you use a strap, adjusted the same for standing and sitting.
I almost never play without one...
I got the Performaxe attachment earlier this year and I suppose the best review I have of it is that I don't think about / notice it when playing. I'm usually sitting at my desk when practicing so it gets the guitar in a better position. I use it with my right leg mostly as that's most similar to where the guitar would be when hanging with a strap.Just saw a Tim Pierce vid and he shows this accessory. Think I may pick one of these up. I play sitting down 90% of the time so this seems it would really help with posture/ergonomics.
Seems to me you could jury rig something for next to nothing, like a thick piece of foam
You turned it into a trem? Impressive.After being on a long waitlist and a lengthy delivery time my Performaxe finally arrived from Italy. What I can tell you is that its certainly not cheaply made though i'm not sure it justifies the price but it's very well constructed. It has some weight to it. Perhaps its made of Unobtanium, Vibranium or even Adamantium. It does make quite a difference in the ergonomics sitting down which is how I play most of the time.