Dimitri,
I would say go for it. I cannot see why going to University would make much difference if you have the money to go integrated already. It will help you in understanding some of the sillybus for JAR but a couple of A-Levels in Physics and Maths should see you through without too much brain screwing.
As for job prospects and employers taking on a 20 year old, all I can say to that is just do it and find out. Itīs up to you to show them you are capable isnīt it?
There are two 19 year olds on my course at the moment and nobody has ever suggested that their age will work against them in the job stakes. On the contrary, they are in the best position.
Best of luck,
VFE. <img src="cool.gif" border="0">