I have had a look at the files specifically for the alchemist and jewler and they both reference the same file as the harvest tools window is not unique to the individual Hubs but is one files used by all the windows. If it works on your alchemist then it should work for your jeweler as the file is the same for both.
What exactly is happening when you hit the harvest tools button on your jeweler? do you get the pop out window? The buttons do not equip the tools .. it just uses them from your inventory and applies the buff that they carry with them.
You might also want to turn on the autoconsume option on your tools usually means these buttons aren't required to be used very often.
Please let me know what exactly is happening as I have tested the mod with my character and it seems to work fine.
Thank you for your feedback
Mistal