OK this description is good and good news is you can use a smart switch in your “box 1”/2 gang box. You will need to change a bit of wiring to “send” neutral to the other box as I have described many times in the GE 3-Way Wiring FAQ. Since both line and load are in Box 1 the smart switch has to go here because Box 2 doesn’t have enough wires - 4 are needed for a master switch
Box 1
- Disconnect the 14-2 line black wire from the black wire of the 14-3 running to Box 2
- Connect the 14-2 line black wire to the line terminal on your smart switch
- Put a wire cap on the 14-3 black wire as you no longer need it
- Connect the 14-2 load black wire to the load terminal on your smart switch
- Connect the 14-3 red wire to the traveler terminal of the smart switch
- Connect the 14-3 white wire to one of the neutral terminals of the smart switch - this will send neutral to your Aux switch
- Your smart switch should have come with a short white pigtail wire, add it to the 14-2 line and load white wire nut and connect the other end to the other neutral terminal of the smart switch
Box 2:
- Put a wire nut on the black wire as you no longer need it
- Connect the white wire to the neutral terminal of your Aux switch
- Connect the red wire to the traveler terminal of your Aux switch
Test and enjoy your new smart switch!