I have a couple of options.
1) I use a few dremel tools. One is a plug-in, and has several speeds. The other is cordless, which only has two speeds. As others have mentioned- way too fast.
2) I do have a drill press with burnisher attachment. It’s in my garage due to limited space in the workshop, and I barely use it.
3) My current preferred method is my Rocky Mountain Leather Supply Creasing machine- Summit X2. It is a filleteuse, but it come with a burnisher attachment that is awesome!! You can really dial up or down the speeds to a slow crawl. It is SUPER quiet (compared to the above machines) as well which is a huge plus. it is expensive but it serves many other purposes (edge creasing, edge finishing, embossing w/ foil and plain heat) and is compact. Really suggest this!
HTH!