I appreciate that you don't want to destroy them. Most people are less tolerant than that.
You have one colony in a tree in your yard. I have between 25 and 100 colonies IN my yard. None of the other people living here are beekeepers. They barely notice the bees.
Are these bees in your tree agressive? Are you just afraid of bees? Do they buzz you? Head butt you? Or are they just flying around minding their own business? If they are agressive (head butting, following, stinging etc.) then your best bet is probably just to have them exterminated. If I was nearby I'd be happy to come and make a try at getting them out of the tree, but the only method that works without cutting down the tree (the cone method) will make a lot more bees in the air during the process (as the bees go out a one way door and can't get back in) and you apparently are already intimidated by them.
Perhaps someone from your area can respond. You coudl post this on www.beesource.com
(go to "exchange") as well and perhaps someone there will respond.