Soldering coaxial cable directly to V4 flex PCB? alternative compatible U.FL coax assemblies?

[Gabrielle Siemonsmeier]

Hi all,
I have two questions:

1. Are there any instructions online about how to solder the coax directly to the V4 PCB, removing the U.FL connector altogether?

2. Are any U.FL - coax assemblies available for purchase (e.g. this one from DigiKey) compatible with the V4?

Thanks in advance!
Gabrielle