Fundraising careers for non EU

Hi all!

I've recently begun my career in fundraising by working on a statewide political campaign in the US, but after the primary in May, am hoping to find work in the UK. I went to grad school in the UK, but unless I'm mistaken, am not aware of much political fundraising. I'm wondering however, if anyone knows of specific charities or NGO's that are willing to hire people who require work permits? I'm finding that most places do not, but am confident there are a few I can put my energy in to!

Thanks!