I was in a cast for 6 weeks, (both heels and ankles broken), but when I could put pressure on them I was in agony for quite a few months due too the fact I destroyed the joints in my ankles but that could be because I fell 50ft onto them in the first place
. So it was about a year before I could walk unaided. Generaly though yes, I should have been able to put weight on them after 6 weeks so you should be ok.
I rekon you`ll have to have some Physio sessions for a bit, but im sure you`ll be lapping in the Ring no problems with your even stronger heel
.
I hope for you a speedy recovery anyway