Have someone tried to do something similar with a 2D opening, where 2D shows a weak two in diamonds or a weak two in hearts? I have actually seen 2D as a weak two in hearts, spades or diamonds, but not just the "one of the reds" version. The full two level could be:
2C = Whatever you need 2C for
2D = Weak two in diamonds or hearts
2H = Weak with both majors (Ekrens)
2S = Weak
If playing a system where 2C is strong, one could use Glen's idea of 2C as strong/weak diamonds/weak spades to get good/bad weak twos in hearts, diamonds and spades
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2C = Strong / 8-11 with 6 diamonds / 0-7 with 6 spades
2D = 0-7 with 6 diamonds or 6 hearts
2M = Good weak two (8-11)