I tried to respond to this earlier, but my machine decided to freak out instead.
Well, even with what you're desribing, it's not a single unit issue.
OK, now, with the discontinued Projector 150, which I have, I have learned how to make custom gobos. I have even made a template to help facilitate this. I also bought the special transparency paper for inkjets to ensure all goes well. Gotta say I like this.
I have made a custom gobo for a client, the initials for a bride and groom. For that one, I had to disable the motor on the Projector 150.
I have a second gobo, which is designed to rotate. Think "rotating commercial" as it goes through the different items.
This unit also includes a "general occasion" gobo insert, as well as 2 others for "Groovy" lighting. But, more or less, it's a static image type projector.
It sounds to me what you ideally want is a moving yoke/head unit where you can commission a custom gobo. Assuming you can do this and you align it right(might be tricky), then you can use the movement capability to move the image around the pre-determined zone of coverage. If you want it ti simply snap from place to place, you can use the shutter function to black it out while moving.
Another option would be a bank of Projector 150's, each set to point at a different location, and using a dimmer pack in switching mode, jump between channels for your position changes.
Another option might be the various oscilating bases:
URL=http://www.americandj.com/ProductsList.aspx?MainId=2&Category=Oscillators]ADJ Oscillators[/URL]
Attach something like the Projector 150 to this, and that's a fairly cost effective option. But alas, the Projector 150 is discontinued. I think I said that already.
Jingle's idea has me interested. While it's not going to do everything you want, it does replace the Projector 150 and then some, but at a price I'm currently not willing to pay.
My best suggestion would be to get a good moving head light that hopefully serves other functions other than just this application, then pay to have a gobo made, which is typically going to be made from glass or metal. Costs vary. But, if I was doing this(and I might now, thanks for the idea), I'd spend some money to have someone do it for me, such as ADJ if they offer that service, IF I went with an ADJ product(which I would, if not then Elation). The company you buy from can answer if they make custom gobos or could probably recommend a location that does.
You may have to "step up" in price to get the features you want.