Propylene is not necessarily safer. If acetylene leaks, it will rise and in
most cases tend to disperse. Propylene, being heavier than air, will
usually descend and travel to the lowest point and concentrate. If there is
an ignition source, you will have a problem.

You need to at least change cutting tips. Better yet, get an injector style
mixer, too. Check out Harris

You need to use grade T hoses, not the grade R hoses often used for
acetylene.

You can use acetylene regulators.

You will use much more oxygen compared to acetylene because of the chemistry
involved.

Check you local supplier for price.