It sounds like you don't want an AHR, so then I wouldn't have one. I would invite all the people that are close to you to the wedding. And for people that can't make it to the wedding(grandparents, etc) perhaps arrange to take them out for lunch after you return to show them your pictures, etc. I think having a super small "reception" when you return where you don't invite the customary people, aunts, uncles, etc would probably cause hurt feelings. If you don't have an AHR you can't hurt their feeling by not inviting them.