I like the idea of You planting 1/2 & 1/2...I've heard that Deer really go crazy for Pears...sure the apples are a no brainer and they do love eating them but I have heard others say that Deer are crazy over Pears!...another thing to consider is which Apples to plant...I have a Early Green Apple tree and the Deer seem to like them the most,then secondly is the Red Apples,so if You think outside the box and plant a different variety of Apple Tree's that produce at an early stage,middle and late stage You'll have an abundace of Apples for a longer time frame....I need to take my own advice and plant some too!
I can also tell You that You need to place wire cages around the Tree's to protect them from the Deer Your trying to draw in so they (the Bucks) don't rub their antlers on the tree's and damage them....and the Dwarf Apple Tree's are easier to prune and get apples off from,the semi-dwarfs are a good choice also.