Sorry, I'm not very clever on pensions and can only talk about my own, if truth were told. I imagine you could always ask your pension provider. From my point of view it might be helpful if the pension could be split.
I personally am paying maintenance out of my pension. At the moment I receive a sum which is just above the level that qualifies me for higher income tax allowances. the fact that I have to pay part of it to my ex is conveniently ignored. I suppose that, if it were possible for my ex's share of the pension to be paid direct to her, I would get the higher allowances and she would pay tax on what she gets.