I am on antibiotics now - it was actually an infection that had been bubbling under for about a week. +, long story short, it's never good when you have to send emails with the words Sale Of Goods Act :/
You get a floatation belt which is meant for pool running, strap it round like a big foam corset, and then go to a deep bit of the pool where your feet don't touch the bottom and run in weeny circles. By happy accident I ended up with 2 belts so could have pool running meetups with an injured mate which is much nicer.
I do wonder though if this sort of plan has more the complete novice to running in mind (as in SA people seem to treat Comrades like the London marathon - braaing in front of the TV one year, in the start pen the next!). In those cases you can see that just getting folk healthy to the end of May is the #1 priority.
The only thing I'd throw in it it's worth experimenting with up and downhills to find out what is most efficient and comfortable for you. I say that because there is a lot of talk about walk breaks and power hiking etc etc but just before my second Comrades I found that not only was very slow running (short steps, hands high) more comfortable for me than power hiking uphill, but it was a scratch faster too. Made a big difference to the following Comrades. But that sort of thing depends so much on individual biomechanics - I can't say it would be better for you, only that it is worth trying various different ways.