Single Point Threading Between Centers

[Masterjuggler]

I wonder if something like this would be good enough. I also wonder if I could use this for fine tuning (and touching up) HSS lathe tool bits.

I have that one, it's handy to store on a shelf in VERY limited space, but it's essentially a disposable tool. If you have some space for one, consider getting a 2x48 or 2x72 belt grinder. They're extremely useful for. Short of that, the 1x30 from horrible freight is better than nothing.