How's your accuracy? If it's accurate enough, that sounds like a good solution.
If that was to me, JS....if not, 'scuse me.
Wax rounds aren't new. We were using them in the south as long as I've been shooting. It's a cheapo way of getting a full choke/buck/slug effect from a 100 year old single shot with a sawed off barrel. When all you could afford was one box of shells, you made do. Accuracy is about as good as any other full choke round, just there's more of a solid clump in the middle and a few stray pellets. I in no way claim the invention of these....it was my uncle that taught me. At one time, they were the original breaching rounds, I've been told.
Slice off the crimp of a split edge hull (I hate wasting hulls, harks back to my younger days) and slice off the base, too. Slide your shotcup/wad down into that and use it as your form. Measure out your shot, I use 1 oz of shot and load it like a 1 1/8 load, and then add your wax. If it cools too fast and won't go all the way down, you can slip that hull/former bottom in a plastic sandwich baggy and dip it into some boiling water for a minute or two and that will melt it all the way down. Use a bit more wax than your shotcup can hold....and once cool, you push it back up from the bottom of the hull/former. Trim the wax even with your shotcup's petals, weigh it and load accordingly.
Shoot them out of a cylinder bore or IC for the best range and effect. I wouldn't try anything beyond a modified, though. They're not unsafe....they compress more than a Foster will so they fit out a choked bore np....but they fall apart if compressed much and all you get is a tighter choked spread of shot.
It's easy to mold these as hollow points....but there's just really no need. They tumble in flight and fragment upon impact no matter what shape they are.
richard