Yes you will be able to get addmission for Mtech in any subject if u do Safety and Fire engineering. but the problem is that u will not knw a thing for writing gate examination.
ter are a few Mtech programs for example
http://www.upes.ac.in/mtech-hse-eng.html
and then NIIT has one. but both has participants from Mech or Chemical.
anyways CUSAT is starting an Mtech program in the coming years. 2 years at most. all the arrangements has been made. so i think u shud wait for tat.
Ask me anything as a reply. thank you