Hope the machine is all well!
My suggestions: Mazzer mini/Macap M4/Macap M4D
There is little between the mini and M4. The M4D is highly impressive although pricey but if you want doserless, blows a mini-e out of the park in my opinion...
Another alternative would be to fashion a stepless mod on your Rocky (for which you will have plenty of buyers if you choose to sell)...