I knew a guy who flew one of these -
Swift Light Description ? Aeriane his was the earlier version. From what he said it was not an easy aircraft to fly (let alone land!) and after a couple of years when he only fly it on very good days he sold it and bought a MCR01 - convention microlight version - which he said was so much easier and nicer. Given you are going to need some form of instruction any 'savings' from going foot launched will be eaten up by the difficulty and lack of convenience.
One of the guys on our strip has built a self-designed SSDR - but it is a bit tricky. On the other hand I have a Section S microlight - downgraded to SSDR and that is actually a very cheap route into flying - accepting you still need a licence.