I have a similar problem with both my boys and have just posted a similar thread. However, I'm not so concerned about moving my 2.8 year old into a group 2 seat even though he's not, as you say, at the magic figures. He is also tall but does weigh just over 15kg, he's just nowhere near the magic 4 year old mark. I figured that his current seat and the group 2 are both forward facing, and as long as I buy one with a 5 point harness rather than using the adult seat belt, can there really be much difference safety wise. There is no way on earth he's going to make it to 4 years old before we have to change up!
Go to the Which? website (if you're a member) to see the safest models available. If you're not, I'll be checking this out in the next couple of days and can post the results here if you'd like. They do extensive testing and crash test all of them.
