We have an Otari 50-50 which has an extra head for 1/4 track playback and runs at
3 3/4 or 7 1/2
A good search on ebay will turn up a number of possibilities. In the CSO we had a Technics which needed servicing. I have collected a number of old consumer machines over the years, all of which have problems, but someone gave me a Tandberg 10XD which I can use if I need to. If I have to transfer something at 1 7/8, I can record it at 3 3/4 and change the speed in the computer (I use Dart Pro98 for this).
You can also record both sides of a two-sided tape in one pass, and reverse the backwards side in software.
Louis Armstrong House and Archives