Infuriating that Inov-8 have dropped their road shoes and no matter what they say, there is no direct replacement in their range. I also have some 255s and 233s which have been great. The only other road shoe I use regularly is the Saucony Fast Witch which is comparable in weight, drop and cushioning though not quite as supportive as the Inov-8s. You could try those for a start.
I have carried a DSLR in a salomon rucksack whilst running but to be fair, it was far too bulky for my liking. I also have a Canon G12 which provides great functionality within a nice compact body. It has produced some great shots and comfortably fits in a bumbag.