It is really safe since its just soft plastic it is well balanced and most of all no weight at all so no unnecessary vibration.
Step 1: This Is What I Used
Double sided tape
Sandpaper according to preferred grit.
Step 2: Different Grit Discs
In case you have a few rough edges don't worry once you have cut a few align them and holding them in the center just run them across a sheet of sandpaper rotating each time.
Step 3: Assembly
Stick on your double sided tape attach your sandpaper and your good to go.
If you want to go a step further you could even use a paper punch to cut out the additional holes so that it collects the dust.
Step 4: Finished Product
Hope this helps other Dremel or rotary tool users.
Appreciate any feedback or ideas
Step 5: You Could Polish / Buff Too
You can even stick some felt , chamois leather, jewelry cloth etc on a spare spice cap and have a decent buff wheel to cover larger areas for that final finish.