I have a very simple Trangia modification for the pot gripper.
It is so simple that someone else has probably done it but I am not aware of it.
It involves bending the inner jaws of the Trangia pot gripper outward, so that they are even with and on the same plane as the outer jaws.
This is done so that it makes it much easier to grasp and pick up, set down or adjust the Trangia simmer ring.
With this modification, it makes it much easier to grasp the tab of the simmer ring without it twisting out of the jaws.

Looks like a good idea.