Standardizing Vegas odds for a randomForest
This is directly related to the idea of calibrating probability values produced by a random forest. Aside from the link, there is substantial literature on how to do this. The simplest approach basically amounts to fitting a logistic regression on the outputs of the random forest to change the response surface into a logistic form.

Once the predictions have this form, you've demonstrated that you have the knowledge to turn the probability estimate into Vegas odds, so that should be a straightforward process for you.