Fine art print shops accepting vector formats

I'm looking for US/EU print shops to provide print and dispatch fulfilment. My problem is that I sell maths-based prints where purity of line and edge are crucial. At present I output directly from Illustrator to an SC-P900 at maximum resolution and get superb results but I am UK based and want to get out of the hassle of dealing with tarriffs and increasingly complex packaging regimes.

The problem I have found is that people who describe themselves as fine art printers often seem only to accept raster file formats. At the kind of resolution I need the files would be beyond enormous for something like an A3 print from an original Illustrator file of only a few megabytes.

I sell world-wide but mainly UK/US/EU and really need to output within the relevant borders. So do people have any recommendation for print shops which are used to accepting Illustrator-based one-off orders for output on museum-quality papers, with subsequent packaging/delivery in those markets.

David Lawrence