The thing about going from scratch and building your own is that, with a bit of creativity you make parts work together. This does require some access to tools - which may be the downside.

A weighty base could be blocks of aluminium from Ebay, or something like a re-purposed barbell weight you got for free.

A magic arm could be $100, or a far-eastern knock-off (which would be equally satisfactory for this application) could be $30

https://www.amazon.com/YAYOYA-Ballhead-Articulating-Friction-Adjustable/dp/B09Q8RKJTD

The double-split shaft collar could be $10 off Amazon.com or less from Ebay or Aliexpress.

There's a trivial amount of screws / bolts involved.

Some hole drilling, one thread to cut and some cosmetic sanding and painting if you felt so inclined.

I was partly motivated by wanting a deeper reach than any sensibly priced stand offered (big PCBs at work and wanting to keep the base of the stand right at the back of the bench, out of the way), and partly because I quite like McGuyvering stuff together and have access to tools and working facilities to do it. I can't lie, I was also motivated by not spending an arm and a leg on it as well...

Can you, for testing purposes, come up with some complete lash-up of a stand out of stuff you already have? An adjustable Anglepoise-style desk lamp as a core, and then some bodgery to temporarily affix the camera or lens to it? The attraction of this as a temporary test-bed is that you might be able to do it for zero cost (minimal functionality is required, appearance is unimportant) to allow you to establish whether the 35mm barrel lenses are good enough, or whether you need to go to the 50mm one. If the smaller lenses are sufficient, then your supply problems for a stand evaporate. If you determine there is material gain with the bigger lens and spend money to accomodate it, you do so in the firm knowledge that you're spending the money wisely.