I try'd it at this way to, but Draft WB dosn't aper at the menue (other WBs don't aper to), - here a screenshot:
But: If it would work, this workflow isn't intuitve, it is awkward... At my personal TB at Part WB i have Tools from Draft, Fasteners, and A2+ WB.
A lot or clicking if you always have to close the steup window, change the WB, open the setup window again, select the WB where you want to have it again...
Btw one thing more whats confusing: The Names of the WBs and Tools should not be translated... If you look at the pic above: its not easy to realize that you have to select "Formteil" if you want a tool from Part WB, - especally not if you have to select "Part WB" at the target menue...