Nice work Drew. I’ve used even the cheap (”Realistic” brand) splitters with good results at VHF and UHF.
If you don’t have an SDR receiver, you’ll find one to be an incredibly useful tool to monitor and analyze your system. An Airspy R2 would be best, or an SDRPlay, but even a $8 rtl-sdr dongle will work perfectly for your needs, along with SDR# or SDR UNO or similar software that will let you see all of your mics, relative signal strength, etc. You could probably replace all of your receivers with multiple instances of SDR software and multiple VFOs but you already have the receivers. The advantage of an SDR-based approach would be simplified RF hardware and redundancy.
Good work, and a very nice video production.
I’m not Drew. I simply thought it was useful, whether you’re a ham, musician or managing a sound system.