We have had a few forum members service their IVA from abroad in the past. It is doable, as long as you keep your IP informed of changes of address and account for currency conversion variations and fees when making payments. However, setting one up from abroad might be more problematic and you will have to prove that the UK was your "centre of main interests" . Brexit may well have further fogged this issue.
My opinions are merely that .. opinions based on experience. Always seek professional advice.
IVA Completed 23rd July 2013 .... C.C. 10th January 2014 http://foggy.blogs.iva.co.uk
