I think your kit is still afraid of going back 'out there' where it's bad. You saved him. He loves you. there is a good chance he didn't get to love his mom and siblings, and receive enough of their love in return. He may have seen what happened to them and be afraid that if he isn't watching the same thing will happen to you, or that you too will disappear.
Talking to him sounds like a really good idea. Yes, he wants attention. he's still a small child. Attention tells him you love him, he matters, you won't throw him out.
My advice would be to move to major cuddles. When the meowing gets shrill pick him up and cuddle him. If he joins you in bed meowing, stuff him under the covers to cuddle him. You will have fulfilled his touch needs. I've generally found that you can give enough touch/attention to reassure and that lessens the NEED-YOU-RIGHT-NOW!
My experiences were not with Siamese.
Talking to him sounds like a really good idea. Yes, he wants attention. he's still a small child. Attention tells him you love him, he matters, you won't throw him out.
My advice would be to move to major cuddles. When the meowing gets shrill pick him up and cuddle him. If he joins you in bed meowing, stuff him under the covers to cuddle him. You will have fulfilled his touch needs. I've generally found that you can give enough touch/attention to reassure and that lessens the NEED-YOU-RIGHT-NOW!
My experiences were not with Siamese.