I don't know about solo crafter dungeons, but I had an idea awhile ago to create "Ocean Fishing" versions of events for the Miner and the Botanist.

A gold mining company out of Uldah hiring day labor for mining their new mine with variable cave locations based on the time of day.

Similarly a deep forest tour out of Girdania with variable clearings to harvest things from with the same 2 hour tour schedule as "Ocean Fishing" tours.

Since there are no baits for these gathering classes I would suggest using a select-able tool interface similar to the former jigs the fisher used. The three for miner could be trowel, pick-axe, hammer or dynamite for specific mining returns. And the three for botanist could be gardening shears, handsaw, and Axe or Hatchet for specific botany returns.