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Tee it off to two tanks should work. You might just need to turn up the counter. Sorry, I presumed you have an external canister that you could fit an inline diffuser. If you don't have canisters for the two tanks, then go with your original plan of using the atomic diffuser.

You should be able to get a dual regulator (up to 5 regulators). $350 for the GLA PRO-2! But surely a Y splitter could achieve the same result, no? Yes too big, IF you are still keeping shrimp in the tank. Get the smaller 55mm one. If you don't have shrimp than 70mm is still fine. I prefer the inline diffusers to be honest. One less item to clutter up the tank. No you don't need a separate bubble counter. Dunno. I have never used a ph controller with CO2 system. Mine is old school, it uses a solenoid & timer. But I'm sure you have better control over the CO2 with a pH controller monitoring and controlling the CO2/solenoid.

I got rid of ADA, about 8 months of use, it starts to break up, i'm using black earth premium, and i'm happy with in.

I went from using ADA and fluval stratum to up aqua sand not sure how popular it is but i like how it holds its shape when it is new you it is a lot harder to crush than other substrates. Comes in black and red variants. No clouding of the water and no ammonia issues. Set up another 10g tank about 3 weeks ago and cost was AU$39 for 5kg bag.