combine a mask with a breath mask and make it internals-accessable

[ZeWaka]

Also, you shouldn't be able to attach a breath mask to a mask that is already on your face. Otherwise, people would be able to equip internals after being stuck by a mustache grenade or cluwne mask.

Completely agree with OP except for that stipulation! It would introduce more variety to the station if people are running around in wrasslin' masks rather than plain old breath masks.