Hi Jeff, I can't stand long either (wearing a back brace now most of the time). My husband got me a hand me down chair with a back thats quite tall. Then I put a very thick pillow on it and lean, kind of a half sit, half stand. If I need to sit for a while I'm still pretty close to the same angle. You may be able to find one at a used office furniture place. I'm finally fairly comfortable painting at an easel for a good chunk of time.
Jean
And Minh, hang in there, this is a process-chop wood carry water.