Without jumping through too many hoops, if you shoot an M-mount camera, you can look at the Leica 90 Macro or 50 Summicron dual range lens. The former is a current lens, the latter you will have to buy used. The 90 Macro focuses down to about .75 meters without the close focus attachment, and goes down to .5 meter with it. Not sure about the specs of the 50 Summicron dual range. There might be a couple of other options in older Leica lenses with focusing attachments (like the NOOKY-HESUM).
In addition to the above options, which actually give you RF coupled focusing, there are a number of lenses that let you focus down closer with no coupling. A lot of the wider Zeiss ZM lenses go down to .5 m, as do some of the Cosina lenses and other RF lenses. Again, no RF coupling below .7 m with these lenses.
As far as non M-mount, I don't really know. There might be some other options with other RF cameras. I might suggest a small manual focus SLR with a 50 macro if you want to shoot film.