Hello Jerrythesnake.
How close do you want to get?
The Leica that you mention gets to about 5 feet without the close-up lens. With the close-up lens, it jumps immediately to 12-14 inches, depending on how the focus is set. You've basically lost the 1 to 5 foot range, which is the trade-off for this type of system.
Pentax makes a 8x42 monocular which includes a screw-on close-up lens with a built-in clear acrylic base. Without the close-up lens, the monocular focuses to about 6 feet. With the close-up lens, it jumps to about 2 inches (the height of the acrylic base). Focus adjustment can fine-tune the focus distance perhaps 1/2 inch. With the close-up lens attached, this is basically a field microscope.
If you want continuous close-focus, Vixen's Artes HR6x21 will get down to about 2 feet. Likewise, the Nikon HG's (5x15 ad 7x15) will both get to about 2 feet, too. But, if this were close enough for your purposes, I'd suggest simply buying a Pentax Papillio binocular so that you can use both eyes.
Bob mentioned the Zeiss models. I have the 3x12 and 4x12. The 3x12 will focus to about 8-10 inches, the 4x12 to about 12 inches. I don't have any experience with the 6x18, 8x20, or 10x25, but I would assume that these will focus pretty close, too. My only issue with the Zeiss models (except the 3x12) is their plastic construction and push-pull focus. All are quite expensive too.