John_C
formerly Skeksis268
Fine tuners on an OFR can get down a full note, maybe even 1.5. Just make sure when you originally tune up to D that the fine tuner is most of the way down.
the whole idea depends on the stiffness of your springs, and how many you have. I find on my guitar if i take the bottom string down a tone the rest go rather out of tune, but i think more and stiffer springs would alleviate this to some extent