1. BOX Browns exist mainly as 3-pin switches in my understanding. Mine are 3-pin, I've never seen a 5-pin BOX Brown in person.
2. Aliaz is 5-pin. Aliaz is basically a Gateron Silent Brown. I had to clip the pins off mine to fit in a 3-pin hotswap socket. If you want something like a Gateron Brown, just buy Aliaz 60 G.
3. If you don't want to go with Browns, you'd be experimenting with more tactile switches. MX Clear / Ergo Clear mod available as 5-pin, as are Zealio/Zilent, OUTEMU Sky, and T1.