As Bangladesh continues to struggle in T20, one option could be to play a completely young and fresh squad. teams like England, Australia started doing this a while ago.
we have Tamim-Shakib-Mushy-Nasir that we cant drop. Other than these 4 players, everyone can be replaceable.
How about a squad like this,
Enamul huq Jnr
Extras: Gazi, Naeem, Shafiul, Raj
If I had to be even more dynamic, I would put Tamim as standby and play Anamul at 1 and play Gazi as another spinner.