Don't waste your money Scott, i did my DT 175 engine without any of those tools. (I did use a flywheel puller though)
The crank case comes apart really easy, i think if i did do anything .... i may have used a strategically placed bit of 2x1 timber and a gentle hammer. Just don't use a screwdriver to prise the two halves apart. I certainly didn't use any fancy tools.
The clutch centre nut wasn't difficult either, a bit of wood that was all and socket set.
I used 2 bits of wood under the piston to do the crank nut and a chain wrench on the generator nut.
These photos may help.