Thanks for the link, yes I’ve already read this conversation. If I get it correctly these watch bands include an NFC Chip, but do not communicate with the watch.
My APS app needs to read /write some data from the Sensor via NFC to be able to initialize it and connect via bluetooth, so that would not be sufficient.
I also read the following conversation about retrofitting NFC. But it looks like they used a NFC reader that connects as a keyboard and just types the string it reads via NFC.
There are other types of readers /writers, mostly with the keyword ACR112U on AliExpress that are “PC/SC-compliant” which appears to work differently. Maybe that would work, but as I don’t own a FAW and don’t know wich one supports USB otg, I didn’t try it yet.