Finances during Trial Seperation

Hey all.
I won''t go into the full details, but my wife and I are planning a trail separation. It is her driving that (my options are that or a full separation. And I strongly suspect it''s a trail to just ''break it to me gently'')

We''re discussing all the ground rules for the trial at the moment.

We''re going to get a separate property for one of us to stay at. We are agreed that we should put all the bills into a single account. For the whole of our marriage we''ve both put our wages into a joint account.

After thinking long and hard about it, I think we should split those bills 50/50. (At this point I should point out, for fairness, that I earn twice as much as her). The 50/50 seems fairest to me, in the sense that that''s how it would look if we were to properly separate.

I don''t think I would be comfortable if it were the other way round saying "I want to trial a new life but I want you to subsidise it", just wouldn''t seem right. Problem is I feel a massive douche proposing it, mainly because I do come out of it better.

People on her been through a trial separation, how did you arrange the finances during that period?

General opinions welcome too.

Are there any children involved? This would alter any proposed future 50/50 split, usually in favour of the parent with care.