Depending on your budget, you may consider a 4" toolmakers vise. Shars has one for about $165. Here's a better price.
https://www.amazon.com/shars-toolmaker-grinding-ground-202-1123/dp/B07ZPC24F3?th=1 $120! They aren't fast to use, but they have very low jaw lift. I modified mine and replaced the screw with a stud and a hex nut. I have both a DX4 and the 4" toolmakers vise, both are quite useful.
Try to get the version of toolmakers vise that uses a machined slot as the hold down, rather than the one that uses pins. One of my early projects was to make my own hold downs for the vise.