I make a trail camera mount.
It wouldn't work on a T post but it works fine on any wood item, Tree, fence post, broken shovel handle driven into the ground, even the side of a barn if one wants to put a camera on the side of a barn.
Three way adjustable, wide range of adjustment, fast and easy to set up and adjust.
And although I do make them for selling, anybody can make one for themselves if they wish.
The design is ultra simple. Just a suspended ceiling screw, a flat piece of metal 3 or 4 inches long x 1 inch wide.
Twist the metal piece 90% close to the half way point. Drill a #8 hole at one end and a 1/4" hole at the other.
Attach the metal strip to the ceiling screw with a 1" #8 bolt and you are done.
If done right the thing can be screwed into most wood by hand. Once in place, attach camera with a 1/4" x 20 bolt though the 1/4" hole in the metal strip, and adjust to like then tighten the two bolts.
That gives you a very basic model and some tools are required to use it.
The ones I manufacture have many refinements and need no tools for installation or adjustment.
Mine employs a stainless steel thumb screw which is permanently attached to the mount. The pivot bolt and nut is stainless steel. And the metal strip is shaped a bit like a key blank, so the end forms a platform to stabilize the camera. Plus other refinements.
Unfortunatly I am not set up to market into the USA yet, and may never be.
This is my mount.
This is my mount in use.
One final note. I have found that the number one cause of camera theft is those belts the manufacturers provide for attaching the camera to a tree.
Anything that replaces those belts that doesn't also employ belts or straps will lessen the chance of your camera being stolen.