Two things came to mind real quick and I have not really thought it out so take this for what it's worth.
First: Show your buddy this page and what you wrote. Then tell him you are going to buy the property yourself and give him his own key and a perminant invatation. He should understand.
Second: Don't show him this page. Then tell him you bought/are going to buy the property and give him a key and a perminant invatation. And tell him why. She should understand.
In either case the next step should be to take him along on a week long scouting trip and do some of that male bonding around the campfire.
I'm trying to say that your reasons for buying it yourself are very good ones and a real buddy will understand and stick with you.
If not I am willing to become your buddy and help you scout.
What ever you do BUY THE PROPERTY one way or the other!