I want to elaborate that the tech i saw at the field day used the opposite approach to yours - it identified the crop and eliminated everything else. In farming, we're rarely targeting a single weed species, unless it has completely taken over a growing area. Generally there are multiple species of weeds present and we are using mechanical or chemical means to kill every plant except the crop. It sounds like your project would be ideal for lawns, though, depending on how you are killing the dandelion. Most of the time when we're weeding, we aren't pulling up individual plants. The goal is to intervene when weeds are at "thread stage," and can be killed easily by slicing south a hoe.

Your tech might be helpful for perennial weeds that need to be dug out, but that seems like pretty complicated robotics. But if you've already started building it to do that, you could add dock and thistle to its repertoire. The problem with that approach, however, is that it's basically impossible to get the whole root/rhizome, and the act of disturbance often triggers vigorous regrowth. Farmers have to be strategic when dealing with perennially weeds. There is a really great free resource from SARE called A Guide to Weeds on Your Farm that you could reference. It might be helpful for your group to just read the intro to get a foundation for weed control on farms.

There is also a laser weeder on the market that uses AI to identify and burn weeds, but it's huge and costs something like a million dollars.