Hi Richard,
I don't know why nobody has answered your query yet, so will try to do so! Unfortunately, the simple answer is NO - AFAIK the only Flarm devices which claim to decode and provide transponder alerts are the PowerFlarm Core (Flarm + ADSB + Mode C/S - c.£1350 plus display & delivery) and the Air Avionics TRX 1500 (Flarm + ADSB + Mode S - c.£1500 plus display & delivery). Both of these also need specific interfaces to connect them to a nav display. Neither claim to provide Mode 'A' cover (which from the difficulty we are experiencing trying to get reliable results for Mode 'C', I can fully appreciate).
What Lee is trying to do WRT Flarm is collect already decoded data from the output of the user's existing Flarm receiver (which is perfectly legal within Flarm's terms and conditions as you own the Flarm unit) and use PilotAware to filter and combine this data with PilotAware's own data before presenting the combined results to your Nav device.
For 'existing' Flarm owners, this will add Mode S (and C if/when we get it running), ADSB and P3i, plus a way of WiFi-ing the data onto a Nav System and as Lee said above access to multiple tablets and voice alerts. Hopefully this will also increase the uptake of PilotAware by existing Flarm users - allowing us to see them via P3i.
For PilotAware Users who don't yet have Flarm, they will effectively be able to add full Flarm Transmit and Receive to an existing PilotAware / Nav System installation for the cost of the most basic Flarm Unit (currently the basic Flarm mouse - available from about £450).
Hope this makes things clearer.
Regards
Peter