Is studying in the UK an option for any of you guys? Many prestigious UK universities offer so-called conversion degrees for people with a non-traditional background. You should be able to produce a solid academic track record and some familiarity with the field, though. For those with a CS background there are many specialized MSc degrees, like Computer Graphics or Machine Learning.

A good example is University College London: http://www.cs.ucl.ac.uk/admissions/msc_computer_science/

The so-called generalist programs are for non-CS majors, while the specialist programs are for people with a CS or related background. Degrees in the natural sciences commonly involve introductory programming courses, so those may be a good fit.