Microlight
does not mean "flexwing" 
There are several perfectly conventional aircraft," tube and rag" as well as smooth shiny, sleek Composite, that either fall naturally into the Microlight category, or are a variant of a Group A (conventional Single Engine Piston (SEP) ) aircraft that usually has a bigger wing, smaller engine to get it into the correct ballpark for wing-loading and stall-speed .
I'd say, if you can afford to do the full PPL course, go ahead, but aMicrolight license would be a lot cheaper and you would be well on your way to owning one, with the saved cash! (well, a damned good down-payment, anyway!)
Have a look at the BMAA website, also the LAA might give you a few ideas!