Apparently bocote has a fair amount of natural oil. Is it safe to stabilize bocote with cactus juice, or will the process contaminate the cactus juice?

I can not give good advice on this since I have never personally stabilized Bocote.  I do have customers who have done it with success, though.  You could always try placing a piece in your vacuum chamber with a paper towel under it and no resin.  Pull a vacuum for a while and see how much oil is coming out, if any.  I am sorry I can't be of more help with this but, as you can guess, it would be nearly impossible for me to test all of the different species of wood out there for issues like this.