Re the IMCr, it's sounding like a good idea. I haven't even started my PPL yet, hopefully it will be next month, but I was going to do the whole lot in one fell swoop, PPL, night rating and IMCr while I still have a training and examination head on. I know a guy who did the whole lot in less than a year without really breaking sweat or taking much over the minimum hours.
I like your attitude regards making it all in minimum hours and within a year, but remember that a newly issued PPL is only a license to learn. For you to be able to fly on instruments with required presicion/safety within 15 hours (imcr) you would have to be a confident PPL with some experience. This is also reflected in the rules surrounding the IMCr. You will need 25 hours of total experience as pilot of aeroplanes following PPL issue before you can start your IMCr training.