Oli you're probably going to have to speak to smaller hosts on a one-to-one basis to see if they can cater to your fairly specific needs.
Large hosts don't lose much by turning your business away and as such thay can be quite rigid with their conditions. Smaller hosts may not have the massive infrastructure but they can be more negotiable with your requirements.
No examples I'm afraid >_<
» Anyone have experience with SimplePie? ... Last Reply: 3 weeks ago by seopher.
SimplePie is the RSS module of choice for us when we're doing such things on large client websites; I have nothing against Magpie and use it for a couple of smaller things, but I have it on good authority that SP is more sustainable for large operations.
Could all be propaganda though...