Those were one of the ones I was looking at as an option. Those according to Evike will handle CO2 but I have zero experience with that because like you I wasn't thrilled with having to buy another adapter to fill them with CO2 that honestly is fairly expensive. But I'm willing to take that route if that's what it takes to get results;)
I was thinking though that single output of sorts would maybe be better for launching, just wasn't sure. And I figured if it was a wash between the styles I'd stick with a shower style just to have either option, but if it does indeed make a difference I'm more interested in launching projectiles than BB's really that will be 99% of the purpose.
Luke