I Just want here to try some ideas and start some kind of debate….
So I want to say what I do if I had the opportunity to try this breeding project
My approach would be to consider following African seasons calendar and mimicking that.
You have mentioned in the caresheet that 10 months of aestivation in the wild is possible but extreme, but for breeding purposes I would start with a long aestivation period like seven months, then awake them at middle December .Preferable in a storm day if you get lucky in the place you are.
My guess is that the trick to breeding them is give time enough in aestivation period to encourage the female to produce eggs.
At this point I would try to give some good meals for one day or two, has they would need a day or two in their natural habitat to achieve breeding places, this is where you see them crossing roads.(Yes I have seem them at night a couple weeks before Christmas 2002 , from Joannesburg to Mozambique border).
With this done male and female must already be prepared for some tests and I will introduced the male to the first one. In a one day 24h/24h rainchamber (see how he reacts like calling or not, introducing another male if necessary, maybe they need to establish territory and feel some kind of domination)
If good reaction were observed by a male I will take the other out and introduce the female at night for another non stop rainchamber day , so amplexus could happen ….if some eggs were laid I do not leave him to care of the offspring