I am missing a small RB on a t-tail…

Would be great for industrial and some home installations

Edit: t-rail of course

T-tail?
https://en.wikipedia.org/wiki/T-tail

It's the same DIN rail.
In fact, there is. LtAP mini https://mikrotik.com/product/ltap_mini with DIN rail mounting bracket https://mikrotik.com/product/dinrail_pro

For the hex (and similar) formats that are born with wall mount possibility it shouldn't be too difficult to screw to it a couple "universal" DIN rail clips, example:
https://widgetlords.com/collections/acc ... ting-clips
on the back, or, if you want it "front facing vertical", a kit *like* this would do nicely:
https://www.robustel.com/parts/s052005- ... ts-screws/

Devices like the hap lite or ax lite are obviously a little more difficult to deal with, but it shouldn't be difficult to adapt common L shaped/angle bracket(s) with DIN rail mounts like the above.

MT is not into this market. Any 3rd party mounting options are simply violence against innocent devices.

There are other vendkrs which have large DIN-mount device portfolio, one example is Moxa. Yes, it comes with a price ...

Any 3rd party mounting options are simply violence against innocent devices.

Not if the device signs an informed consent paper.

example is Moxa

And absolutly horrible from a software and management perspective

I am missing a small RB on a t-tail…

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If you have a 3D printer there are a few designs around like -
Mikrotik hAP Lite DIN Rail Mount Enclosure -
https://www.thingiverse.com/thing:5193941
.