I have been running this mod for about a week now and am really happy with the quality improvement it gives.
However; One of the benefits I found with after market ABS was the stronger layer bond with running it at higher temperature.
This is the only drawback I have found so far with using a lower temperature - support removal is a doddle, but layer bonding is back to the same as the OEM filament.
I tend to print the first few layers at around 240 then drop to 220 for the rest of the print.
Given the unlikelihood of S/W controlled extruder temperature, I have designed a PCB for a more mainstream mod that plugs into the extruder PCB in line with the ribbon cable. The ribbon cable then plugs into the new PCB, so no cutting or soldering required.
It has the same LCD and buttons as the images I posted further up, but incorporates everything on a 40mm x 40mm PCB that should be easy enough to design into a modified extruder cover
I have also extended the range for +40 to -140 degC offset (120 to 300 degC when on ABS settings).
I am having a batch of 6 bare PCBs made - PM me if you are interested.