Wow - those cabins are certainly going to be 'aromatic' towards the end of the flight with people nipping the cheeks of their ar$e$ and squeaking out the odd blast rather than forfeit a 1 Euro 'relief charge'.
Seriously though, there are health and welfare issues and although I am unsure as to any specific legislation in relation to the provision of free suitable facilities for the performing of ones ablutions on an aircraft, I suspect that this action would be unenforceable - although MOL appears to be a law unto himself anyway.
Having never flown with this lot, I am assuming there are still free sick bags, therefore I would like to suggest that these could be utilised into a personal 'urinal' with the 'finished article' left under the seat for future disposal.
Sorry that this post is somewhat lavatorial, but as MOL seems to be taking the p**s, I though I would redress the balance by suggesting a way of leaving it!