I used a Dremel with a 1" diameter felt wheel and a little bit of green compound to clean up & buff this:
The 'shine' you see on the bolsters & delrin is the finished result.
It's not impossible. You do need to be very careful, though. The felt wheel with the compound will generate a lot of heat quickly. Use the lowest speed possible. When working on or near delrin or other synthetic scales, use VERY LIGHT pressure (as if you were polishing with just a Q-tip chucked into the Dremel) and sweep VERY LIGHTLY across in a smooth motion. Lingering in a given spot will burn/melt the Delrin in a second. The same will result if you apply even a little too much pressure.
The 'uneven' finish issue, isn't really as much of an issue on something small, like a bolster. I've had good results by moving the Dremel back & forth in a direction perpendicular to the spinning motion of the wheel. In other words, sweep LIGHTLY back & forth in a direction parallel to the long axis of the tool. On the knife pictured above, I had the wheel parallel to the 'seam' between the bolster & scale, moving the tool back & forth from the seam, towards the end of the bolster & back, while working gradually across the width of the bolster.
I'd strongly recommend practicing first with your Dremel on something that you're not afraid to damage. Find something made of plastic/nylon/Delrin and see what results you get with it when applying excess pressure and/or lingering in one spot for a length of time. With lighter colored material, it's possible that you'll see some discoloring too. You'll quickly get a sense for the 'touch' needed when working on/near soft materials.
There's also the potential for 'skating' into something you don't want to touch. The spinning wheel can 'bite' or grab if you lean into it too hard, or if you don't maintain a steady hold of both the knife and the tool.
The felt wheel & compound won't do much for removing scratches in bolsters. For that, I've had good results with 400/600 grit sandpaper, then higher if desired.
I'm not saying the Dremel is the best way to go about it. But, since you have the tool already, there's nothing wrong with taking the time to practice with it and find out what it's capabilities are (and yours too). Like any tool, it can do some very nice things in the hands of someone who takes the time to figure it out. Good luck.