I have one of those. The handle was too short so I took it off.
I have the taper cut on a longer handle. If you put the shovel head on the long handle and give the end of the handle a bounce against a rock it seats the sovel tightly on the taper.
To get the shove head off you need to hammer it off or drag it back against a rock hard. You don't need the handle bolted to the shovel.
The handle I use doubles as a walking stick, just a bit over 5 feet long 1.25" ash.