Comment by TeMPOraL

No, I'm unfortunately not aware of any, but I stopped paying attention to the field years ago, after it turned out to be almost entirely focused on surveillance capitalism.

But back then, the startup I mentioned had a local competitor too (which initially marketed itself to industrial and medical use, aiming to actually improve something in this world for a change - that's why I liked them, until they too pivoted to helping retail fleece customers). The beacons made by that competitor were designed to be opened, and to have the battery swapped when it died.