Example of alternative in action: https://www.meetjeleefomgeving.nl/mjlo-01/
Links to the rest of the devices at the top of the page.
Started out life using LPP, then went to a more efficient payload format that used FB, translated to LPP and relayed to Cayenne, now all on FB. So plenty of code experience around the subject.
We’ve maps and all the usual FB widgets as well.
But will need to figure out hosting, costs etc