Ah, I understand now. Good idea. Here's mine:
"I wholeheartedly welcome all members, those already joined and those who will join in future. Please take this welcome as an all encompassing welcome to each and every one of you. I won't be welcoming you individually, as I wouldn't if all the people on a bus waved to me, in such cases I would offer one wave which is meant for all passengers. Please take this special welcome as all my waves in one go".
About right?