Peter - it may be worth trying a simple butane-can torch before you
shop for anything fancier. It’s cheap, and it will be informative.
I use a little one - very like Cookson’s 999 955 - for silverwork,
and occasionally a bigger butane/propane can-type one from B&Q.
I have oxygen & propane in cylinders on hand for blacksmithing and
welding, but I have never found it worth the trouble to use them for
I don’t think you’ll get far trying to use compressed air instead of
oxygen in a two-hose torch. Air is one one-fifth oxygen, so you will
be supplying four parts of cold nitrogen to your flame for every part