I still think you'd be better to choose three different varieties on M9 or posisbly M26 rootstock. They'll be a much better balance of tree size and pruning workload, for the way you're proposing to grow them.
M26 is happy in average soil and doesn't need much feeding or watering compared to M27/M9.
I like my trees to be servants, rather than demanding pets which need feeding, watering and regular grooming (pruning).
I can see all kinds of problems trying to keep the different branches growing where and how you want them to. I really don't think that a multi-variety fruit tree would work well for the intensive training and pruning of a fan or espalier.
M26 is happy in average soil and doesn't need much feeding or watering compared to M27/M9.
I like my trees to be servants, rather than demanding pets which need feeding, watering and regular grooming (pruning).
I can see all kinds of problems trying to keep the different branches growing where and how you want them to. I really don't think that a multi-variety fruit tree would work well for the intensive training and pruning of a fan or espalier.
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