If you're having too much trouble drilling for pins, try using a new cutting disc in a grinder. Grind a slot down the centre of the tang, leaving around 1" at either end. You can then fit your pins in the slot, down the middle of your handle. The gaps between the pins (in the tang) will be filled by your epoxy & leave an awesomely strong handle.
As for fitting a bolster, that'd depend on the shape of the tang. If it's straight, or tapers away from the blade, you can chain-drill & file out a piece of brass/nickel/gold/whatever and slide it over the tang towards the blade.
It'd be a great help if you could post a couple of pics of your blade.