Yeah, you can certainly do that. If you own an outboard compressor that you really like the sound of, this is a great way to get some analog warmth into your mix. There’s really two main ways to do this:

1) If you have all the returns of your DAW patched out to a console, you can use a couple busses (or stereo buss) to subgroup the drum mix. Then patch these buss outputs to the input of your compressor. Take the compressor output and patch it to two available channels on the console.

2) If you don’t have a console you can simply use your DAW’s I/O insert function. Replicate the setup mentioned in the post, but instead of inserting a compressor plugin on the Aux Input channel, insert the I/O plugin. Set it to use two available outputs and inputs, and patch that to your analog compressor accordingly.

Hope this helps. Cheers!