What about the Commonwealth as an alternative international forum? I understand the concerns that come from Africa's heritage as a colonized continent, a very exploited continent, but the Commonwealth does contain a number of significant players who are also African, and it seems to me that this, combined with a high degree of respect for concepts like the rule of law, might cause this to be another international venue that might be more helpful.
I would also add that I can't help but notice that your own organization appears to have a very high degree of support from people who are following it in the United Kingdom, including a number of very prominent people there, which suggests that there's a high degree of interest already in Zimbabwe in at least that part of the Commonwealth.