Injured with calf tear through Feb, overdid the training in the first 2 weeks of March so got very painful shin splits for the first time and off the road for the next 10 days. Returned and did the VLM on Saturday with the pain free return thanks to taping (see youtube on how to do it), gentle massage, icing the painful bit and running in compression sleeves. Shave the injured bit for the taping and massage, Good luck.
I am impressed. Rest and cross train well and I look forward to hearing how you did, and how you found Prague, on my (long) list of marathons to run. Injury and tapering is an issue of interest to me as I've missed 6 weeks of training for the London marathon since February all the long runs!. The cross training (I hope)has really helped.
You've done the hard bit and built the endurance. Without knowing your time goals and background, my view would be not to increase the chances of the PF totally scuppering running in an overseas marathon and cease (if you resist) running. A chap on the sub3 forum had PF, ran an average 13 mpw pre-marathon but did lots of cycling to maintain his endurance and fitness and ran 2.59 in the hot 2007 FLM - he was a 2.45 man. You may lose a small % of fitness but cycling (at a good tempo) should maintain your endurance and speed.