Similar to the bolt cutter grinding approach, you can buy versions with
it already part of the blades. You can buy them at the hardware store
for about 60 bucks depending on the size. They are actually designed
for crimping/swaging connectors on wire cable (the structural kind).
We also use them on large size crimp-on terminals. Our crimper, which
is the smaller of the two sizes, will crimp up to 1/8" wire cable or
the crimp connector on #6 wire. The larger version will crimp up to
1/4" wire so I would assume it would probably do up to about 2/0
connectors. We crimp our connecters first and then drip molten solder
down the gaps to help with the electrical conductivity.