I've had a flex shaft Foredom for 50 years, changed out a handpiece for comfort and two sets of brushes. HF has a cheapo 1/10 hp one for really cheap with a coupon.
Funny, though I still use the 'bay and auction Dremels with old drill stands router tables, and other accessories more than the flex shaft.
Look for magnetic razor holders on the search.
A good one is here:
Bill's Straight Razor Info: Making the Blade Safety Jig
I've made a few similar. The advantage is thet the blade is tight to the metal which serves as a heat sink also. I have used a piece of steel shim stock over the edge while Dremel buffing and sometimes not.
Have fun! Life is too serious to take solemnly
~Richard