Yes it would be nice, but one of the problems with the brewometer is that it communicates via Bluetooth 4.0. Since the photon spark does not have Bluetooth connectivity you need at least a raspberry 3 (or lower with Bluetooth stick) to be able to communicate with the brewometer. Big question is if the guys of the brewometer were smart enough to incorporate some sort of encryption in the SG and temperature data. If so it is probably not possible.
An next to this I'm wondering if the thing would actually work in my SS conical. Since it will act as a Faraday cage, the brewometer can only send out data and cannot receive anything. I'm not familiar with the bluetooth protocol, but based on experience with other bluetooth devices you always have to link it, I guess it will not work in stainless fermenters.
Elco is busy with designing an SG sensor, however it is not high enough on his prio list SG sensor