Dave: I've used 64-66-inch longbows for years in stands, both climbing and hang on, mostly Lone Wolfs. The hand climber on a LW is fairly small and folds up if you have the time and opportunity to stand. Seats also fold out of the way on the hang ons. Though, in truth, I take most of my shots while sitting.
One key is to position the stand to take best advantage of the shot you're most likely to get. I agree that the 5-8 clock position is a hard one for a right hander, particularly if you can't your bow. As others have suggested, may need to practice with different bow angles. I can't say that bow length has ever caused me to not get a shot ( I even shot one deer completely behind me, which required some body contortion and faith in my safety belt.), but they're not going to be as maneuverable as a 36-inch compound. Good luck.