That's a tough one. Because all of the information will stem from the one database. I tried to do some workarounds, and you can add some information in the address 2 line of the main demographics section in admin, but it doesn't look that great. And, it doesn't even up in the address of the script. You could put the phone numbers and name in the Comment section in admin where it is saved for every script, but that looks rather gawdy as well. And, you wouldn't be able to put comments in when you needed.
As far as the notes, I don't know. The letterhead could likely be changed. AC could help with that.
I am sure there are many, but my recommendation would be to contact Wendell. You can just click on him to the right in the Top Posters box and PM him. I say this, because he has two locations with one database. He would be perfect, because he used to have two locations and two databases. So, in the latter, it was probably easy. Not sure how he had it set up. But, now he must be in the same boat, but he has had a long time to figure it out. Maybe he will read this and post in the thread.
