You only need a drill and a file to make this, but it might take you a few decades. The shop that I first saw with one of these stopped working on bikes, if that tells you anything. I swear someone had a version with a hydraulic jack, but I couldn't find it.

I just happened to see a very pretty version of this on insta. Sorry if you don't have an account, couldn't find another version
https://www.instagram.com/reel/DAmCizWvcAn/

I might go back to boring them out on my lathe. Seems like the best way of doing it. I'm not going to use a drill bit again, that didn't go well.

I tried the air hammer way of removal, and couldn't get my seat post to budge. Harbor Freight air hammer, probably matters a little