I wish I could be there to help, Surly. I had really good teachers. This morning, it is very cold, here. On my way to the body shop, following our daughter in her 16 year old GT wagon to have a tiny bit of rust repaired, I tried the method again - this time slowing it down a lot. Speed of the double clutch process does not matter. While a double clutch can be done in a fraction of a second, taking a second or more has the same effect. And on cold winter mornings, slow is always better. With the slow double clutch, the result this AM was the same - perfect shift from 1st to 2nd gear.
Yep. Rev matching after the second clutch could have unwanted consequences, especially in your LGT.
If I can remember back all those years, I think I divided the process into 3 parts:
1) Release throttle -1st clutch - shifting into neutral - release clutch
2) Rev match/2nd clutch/shifting into desired gear
3) Release clutch/drive...
Kind of like trying to tell someone how to tie a neck tie...
Best to you, Surly.