The only thing I would say is, what is your long term goal? If you are working towards a CPL and a job in the industry, all the chopping back and forward may look a little detracting. It may not and I may be speaking out my ar*e, but if I was interviewing, I would be looking for a solid pathway.
However if you just want to get your PPL for the fun of it, work out the costs. I cant help but feel though you may end up spending some extra dollars on conversions and revisions moving between them all that would not be spent just sticking to the PPL stream outright, so may negate some of the benefit.
And last thought, flying is bloody expensive, if you are scrimping on the training now, it wont get any better later when you are still paying $300 per hour wet tacho time for rental for fun,