Pam,
I really do not want to do anything that would limit your ability to participate to the fullest. I see nothing inherently problematic with including any and all cards that you, or anyone else, would be willing to contribute.
Although I am not specifically asking for room keys, I would not refuse them either.
The only thing that is not negotiable is that all proceeds are to be specifically earmarked for the building fund.
Thanks for your participation.
Best Regards,
Murph