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in The potting shed
Rootstock M26 or MM106 can be put in spaces of this size. However, Bramleys are what is known as partial tip bearers, that is some of the fruits are produced at the ends of the stems and some along the length. Espalier is not the best form for them as you are always having to trim them and so lose some of the potential fruit.
I've never tried a fan trained tree, but it sounds as if it would need the same pruning regime as an espalier in that you are trying to make the tree form a shape that it would not normally want to make and you are limiting its growth by pruning bits and pieces off it. The Bramley is a handsome tree but it is one of the more vigorous apples and I have the feeling that the two of you would forever be locked in a battle of wills.
Maybe there is someone here who has had a Bramley and has grown it in a restricted form?