There are loads of screw in bottle regs on the Market, some are even adjustable at the primary erg and therefore don’t need a secondary reg, although nearly everyone used a secondary. Also hp air tanks do come with burst discs, albeit hp, usually 1 each side of the regulation.
I’m 99% sure a bottle reg designed for a 1.1 ltr or similar size will not fit onto a dive cylinder size cylinder.
Happy to give as much advice as I can, used to be a sponsored dye team player and can thoroughly recommend their throttle reg and inline regs.
P.s I know stako had a period where their cylinders where of questionable reliability. I have experience of one serious failure and have a friend who experienced the other. These failures where apparently due to a contaminated air source that caused oil to be atomised.