Any question answered...

IMO yes, but how much do you weigh?

To be honest I'm sure that 28h/32h would be fine. My main fixed wheels that get ridden around London are 28h/28h open pros and I haven't had any problems (I'm 13st ish).

IMO a much better reason for not choosing 28h on the front is that it usually seems to be a ball ache finding 28h and 32h in the same rim.

If you do have any concerns maybe get a 36h on the rear and 32h front, but my earlier comment still stands:

From my limited experience and the more I read, I think that for the average cyclist, any half decent 32 hole rim, built 3 cross, to a reasonable standard, with a tyre that isn't shit will do the job well 99% of the time. Further, I think that anything beyond that mainly comes down to pure bike geekery*.