Hehe, I hope you didn't hurt yourself. Yeah, you're right about him being an Ainur - they were the offspring of Eru Ilúvatar's thoughts in the form of music, when the world was extremely young - but when they came to Arda, they were just called the Valar. I agree that he would be able to live completely outside of their knowledge, but I don't agree that he would live outside their influence. To explain: I'm a musician in waking life, and I reckon that I (can) be influenced and inspired by the Universe, but it's outside of my knowledge in that I don't understand what the hell it is. I don't want to drag on about this point just at the moment, but I reckon we all (including everything else in nature) have a soul, and that simply put, the soul is the Universe, and the Universe is a soul. So I get inspiration from my soul. That's what I mean when I say the Universe inspires and influences me.
Something that really dissuades me from agreeing with you though, is that Tom was very reluctant to get involved with the wars, and Gandalf said of him that if the ring was put into his possession, he would just put it somewhere and forget about it. That's something that I think Tulkas would be very likely to do - he was exceedingly strong but he much preferred laughter to war, and would have been very quick to forget about dark matters such as Sauron's Ring.
Also, I was thinking about Varda being Elbereth, and the cries of help to her the Elves put into Song, etc. I always imagine her to be some sort of legendary figure that the Elves know little about, and would be unlikely to live in Middle-Earth, relatively close to the people who call for her help on occasion.
I don't know how and where the Hobbits originated, but I'm dubious that Manwë knocked them together just to beat Sauron. For one thing, I still think that he's in his Halls on Taniquetil and isn't bothered about the goings-on of Middle-Earth, and also, it would have been a very long job to create the Hobbits just to destroy Sauron. It would have been easier and quicker for himself to just take the thing and throw it into the Fire - or indeed, destroy it by his own means. But... there is a but: I do think that Tulkas (my dear Tulkas) might possibly have created them. Hobbits love humour and innocence, and food, and just generally having a good time, and don't care much for adventures or wars, or Dark Lords (however scared of them they are), and some of those characteristics, Tulkas has for himself. Well, mainly the humour and innocence. But, I don't think that he would have created them just to destroy Sauron. I don't think he would have had any intention for them at all, except to live as innocently and happily as possible.