im sure there can be a workaround, after all why not, it was possible in renegade and not everything is done with malicious intent
replacing boink with http://vocaroo.com/i/s03CRO7WsVDX would be a good start
replacing prox/c4 with this http://vocaroo.com/i/s0OULHA5JibZ
http://vocaroo.com/i/s11mcV5ZmKhS for chaingun, imo the current sound is ridiculous