I can’t even imagine how my friend would take it.
OK, OK, time out. You haven’t tried talking with them about it? If you have as strong a mutual (platonic(ish?)) relationship with them as you say you do, then it should be able to survive a serious conversation about your shared future, especially if you emphasize that you want to try to keep them in your life in a major way like this.
That conversation will probably be hard, and I really can’t think of a solution that would feel perfect if I were in your shoes, but I would sure as hell rather have that conversation than the “I made a decision, and here is how you will be impacted” one, or the “I kept my life on hold because I was worried how you might react to talking about it” one.
I don’t know your personality or your friend’s personality, so I can’t promise that you will sort it all out without emotions running high, or what the ultimate outcome of such a conversation will be.
But jeez, bud, you’ve GOT to be able to have serious talks with people whom you trust and care about.
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