Hi Russ,
I can see no reason why you can't solder the existing wires to/from your SkyView onto the appropriate wires from the RJ11 connectors plugged into the FX. The wires are teeny and you'd need plenty of strain relief or they'll easily snap. The trouble is trying to crimp the AWG24 (for instance) wires into an RJ11 plug.....they're too big for the holes

I have asked about the exact layout of the FX RJ11 plugs but have not got a definitive answer. Lee did say to wire them as per Flarm but, unfortunately, they may have had a standard layout once but they don't any more, it would seem. As an example, I have attached what would appear to be the Flarm layout for RJ11, however, the other day when installing a Flarm indicator (LXLED+) we had one manual saying pins 2 & 3 were RS232, 4 GND and 5 DC but a slightly newer manual saying pin 1 is GND, 2 & 3 RS232 and 6 was DC. Same Flarm device and a couple of months difference made a big difference to how they were wired and did nothing to convince me there is a Flarm standard.
SO, the upshot of this is we need a kind soul from PAW to give us the definitive answer on the RJ11 pin layout for the FX. Pretty please

don't suppose it can be pushed into the same plug can it rather than needing to use two like the standard PAW?
HMmmm, I don't know but I can see no reason why not but it would depend on how the FX has been configured internally. It might be that the 'In' RJ11 socket does not have an RS232 out connection internally and the same for the 'Out' wire. If both RJ11 slots are wired internally for in and out then you could (in theory) use the In from your SkyView GPS serial Out and the Out to your SkyView Flarm Traffic serial In.
SO, another pretty please; are the FX RJ11 sockets wired internally for RS232 in AND out (Rx/Tx)?