One does not truly access the blockchan without running a full node. Any other scenario involves reliance on a third party.
Do you understand what a peer-to-peer network is?
whats wrong with having a dumb peer that can't validate blocks and can only push TX's.
dumb peer-to-peer network
What's wrong?
It can be cheated.
You do understand the security implications of relying on SPV do you?
maybe you should tell all merchants who use bitpay to process and convert BTC payments they are at risk of being cheated.
you're being overly paranoid, and your ivory tower is really high.