The leaning r shape is a common Latin abbreviation. It is sometimes written as the VMS scribe writes it (so it looks a bit more like an r) but also frequently written with slightly more of a lean so that it resembles the number 2 which means you could potentially add it to your list of glyphs that resemble numbers.
There aren't really that many unusual glyphs in the VMS, considering the time frame. Even gallows characters resemble P and H shapes and the figure-8 glyph resembles both an i and a closed Greek-style terminal "s" (which was commonly used instead of other "s" shapes up until the end of the 14th century). The curled back tails may seem unfamiliar to modern eyes but were very common in medieval scripts. What's unusual about the VMS character set is not so much their shapes but how they are ordered and combined.
There aren't really that many unusual glyphs in the VMS, considering the time frame. Even gallows characters resemble P and H shapes and the figure-8 glyph resembles both an i and a closed Greek-style terminal "s" (which was commonly used instead of other "s" shapes up until the end of the 14th century). The curled back tails may seem unfamiliar to modern eyes but were very common in medieval scripts. What's unusual about the VMS character set is not so much their shapes but how they are ordered and combined.