sorry but you not thinking this out clearly.
I like to think I'm thinking this out properly, I'm asking questions to learn both why and why not,nothing has been done and no cost outlaid yet. Somethings things are over so complicated just to justify the cost in this country!
In NZ we can buy a house and move in, in 3 days, I know, I've done it, 6 weeks for me to move into an empty house in the UK, but lawyers needed to justify their fees!!!
So add a blending valve.....do I need a pump? I can't see a reason for a manifold as only plan to run one loop in the kitchen, off the rad network.
I have a sealed heating combi unit, should the flow from this be enough, I understand using a pump in multi room systems.