Because the water tank takes a long time to dry after mopping, it would be nice to have a second one to attach to the dust collector so I could run the L70 while the first water tank is drying. Alternatively, a replacement for both the dust collector and the water tank would work.
Replacement water tank for Robovac L70 Hybrid
It would be nice if they sold the part separately
You should ask the support.
Your proposal is a real useful one, so it should be given some attention.