Kabsetz
You say: "Any lightweight monopod or selfie stick will do".
I add my own "cheapo" example. I attach a £1 selfie stick weighing 104g that I bought in a "Pound Store" a few years ago to a secondhand 720mm fl lightweight "take everywhere" bridge camera weighing 280g. I then go birdwatching with stick and camera immediately ready for action hanging together from the camera's neckstrap.
In reply to Stu57, I don't switch off the image stabiliser on the camera. I did a test trying to get feather detail on Sparrows outside my bedroom window, and got better results with the image stabiliser on.
Presently I am testing setting the camera up, by default, in portrait orientation (for better framing of birds that are perched upright), with the stick held vertically. I then, as necessary for other shots, rotate the camera into landscape orientation, and without changing setup, hold the stick instead horizontally.
I gather that, for whatever reason, some photographers are happier using a camera in landscape orientation. On the other hand I am fed up with cutting off birds' (or peoples') feet when using a camera in landscape orientation. I have set the focus point 5 clicks high, but find myself still doing it.
The result of testing is that, ergonomically, so far both portrait and landscape setups have performed satisfactorily. Optically, preliminary scrutiny of images continues.
Stephen
Nobody has mentioned attaching a V-Mount to a selfie stick. 7DayShop in England, I believe, ceased to stock a Finnish-made V-mount about five years ago. I have, however, just now carried out a Google search on string <v-mount rifle rest>. I found another UK seller selling V-mounts for £3.89 plus £1.50 postage. US sellers & AliExpress also offer V-mounts. The Vortex mount is outwardly identical to the 7DayShop mount