As noted above, there really aren’t many options anymore. For blanks, even James Green doesn’t make (to my knowledge, at least) a 10ft blank as light as you’re looking for. I own (and love) his black glass 10ft 5wt ‘trophy trout’ blank, and it’s really more like a 10ft 5/6 - I use a 250gr Commando on it. I’ve tried a 200gr and it really needs more.
Probably your only option for a blank is a custom roll from CTS in New Zealand, but it’s going to be very expensive. I explored it with them about a year ago, and they were going to be able to make me a 10’3” 3wt with a grain window of about 175-250gr but all in it was going to cost around $700 for the blank alone. If you’re able to spend that, I’m sure it would be a great rod.
Probably you’re best bet is to keep an eye out for an Echo Glass 3wt switch. That would fit your bill as 200gr is really nice on that rod. If you’re a member over a speypages, it might be worthwhile posting a want ad. Someone might have one squirrelled away.
But you can’t have mine!
Oh, and the AFTMA spey line ratings are basically meaningless at this point.