You could basically just use something like this to join the patch cable (the one primarily going to the wifi receiver) and the guitar cable together https://www.amazon.com/Devinal-Coupler-Adapter-Changer-Connectors/dp/B07CW9LF5Y

Stick to the PBA-4 if you already have it, unless you need some additional space.

Cool pick container :)

Get some TRS couplers and some hosa cables - preferably ones with straight and 90° ends on either end since 90's generally work better on pads and cymbals.

Also recommend these ties, they work fast and are easy to add new ones - it really cleans up the wire mess

I've got 11 toms and like 8 other things running into a Mimic and a TD25 so I've got some experience runnign cables for this lol