I've made my own fork spring compressor too out of a Quick-clamp and it worked well, but after spending $18 for a true tool meant for the job, I'd recommend doing that the first time.

The clutch spring is MUCH stiffer. IMO, I wouldn't risk stripping the bolt or sending the parts flying across the shop or into your face or damaging your valuable hands... $60 is worth it for that job. Think of how much you're saving already by doing the job yourself!

I will mail you mine from So Cal if that's closer for ya