Mark, I'm concerned with the relationship, respect, and friendship I share with my two instructors. I think perhaps you didn't read the thread completely.
If you share relationship, respect and friendship.. then they will understand.
I understand your situation - but choose what is right for your aikido development. If you are true to your actions any good instructor should eventually understand and support you.
I have a senior student who is likely to go to a different city within the next year or so. I would love to keep him here, but I wouldn't expect him to commute since they have great dojo's in both the relevant cities. And he should definately go on practicing with them. I'll miss him, but look forward to see him at seminars. Is this any help?