Sadly I can’t point you at a ready-to-use system which is a single chip. Open source communities don’t have easy access to silicon foundries to produce such a thing. libre.space is working on a radio board based around an AX5043 chip I believe, which is capable of doing FSK and BPSK-based modulations.
Unless you can get a ‘OK’ in writing from Semtech, or provide other legal advice that it’s fine to use a reverse engineered implementation of one of Semtech’s patents without exposing us to legal issues, I don’t see a project like SatNOGS ever including a LoRa decoder. You can continue to push received packets into the DB for display, but don’t expect to be able to call on the large ground-station network for support. (Also being on 915 MHz really doesn’t help with that either - what made you choose that band?!)
It’s also worth noting that existing modulations schemes like the forward-error-corrected BPSK modulations used on the Funcube sats are just as, if not more, robust than the LoRa modulation, and they are not incredibly bandwidth inefficient like LoRa is. I’m sure someone like @EA4GPZ could provide more detail on that.
LoRa was designed for a congested ISM-band environment, having to deal with many co-channel interferers. In the amateur space segment, LoRa uses up huge amounts of bandwidth for no good reason (62 kHz or 125 kHz for what data rate?!), and has the potential to interfere with other users. If LoRa continues to be used on the amateur band, it should be relegated to a corner of it where it is less likely to cause issues.