I decided to try Flynn on greens last night, because it suddenly occurred to me that he MUST be old enough now. I've just been too busy with school to take the time! He smelled the plate and even moved the lettuce around a little bit, but he wanted nothing to do with it.
But, of course, as soon as I pretended to eat it, he HAD to know what he was missing! He ate the whole piece you see here.

And happily :)
Thanks for the suggestions, I think I'll wait awhile before I get him neutered. Hopefully he will keep up his excellent litter habits and manners until then :)
One more question- in the above picture, you may notice how long his nails are on his back feet. I tried in vain to cut his nails yesterday but could only manage to do the front feet. First I tried just sitting him on my lap to do it, and that was definitely not going to work. So then I wrapped him in a bunny burrito with a blanket and managed to do the front paws. I could not manage to hold his back feet still long enough to do them though, because he REFUSES to be laid on his back for a trancing... trust me. So how am I supposed to get those back feet? They have to be pulled back in an awkward angle the way I tried yesterday, and he didn't like it- I don't blame him.
He gave me a good thump after safely back on the ground!