Though I don't know the answer, I have some suggestions; look into the Meridian tuners, I suspect they have remote and also the Linn tuner(s), and I don't necessary mean their current lines, if they are still making them.
Also, I would contact Don Scott and see what current tuner he would suggest with his mods.
Also, I would contact Don Scott and see what current tuner he would suggest with his mods.