Stuff me
If you look at a lot of finished still posts you see collection jars balancing on all sorts of kitchenware containers, buckets from the shed, stacks of this or that etc.
Why not have a piece of 3/8" over 1/4" for parrot or for PC end point 3/4" over 1/2" (1" over 3/4") with a SS finger tab lock screw to adjust take of point height so collection jars can be at a safe height on a flat stable surface. Simple easy works at any angle...might just do it myself this week!
Spare thought
bt1