Look specifically for a Pacemaker Crown Graphic, with a Graflok back (and NOT a Graphic back). The back's ground glass frame is mounted with push-in clips that allow it to be removed quickly. Then, the Fuji PA-45 or Polaroid 550 back will nestle in that spot, and can be locked down with sliding tabs above and below the opening.
For this purpose, any lens is fine. They usually came with either a 127mm Optar or a 135mm Optar. The 135 is better but both will work fine for instant film. Make sure the camera has the right cam for the lens if it is a top rangefinder model. If it has a side rangefinder made by Kalart, these can be adjusted to work with any press camera lens.
A Crown is the lightest and cheapest of your choices. The Speed has a focal-plane shutter you'll never use, and it's thicker and a bit heavier because of it. The Super is a later and more expensive model, but it's a bit nicer in ways that may not be important for your use.
$300 will get you a decent Pacemaker Crown with a lens. Add in $100-175 for a used or new Fuji PA-45 (less if you find an older Polaroid 550) 4x5 pack film holder. Well under budget and fulfills all you requirements.
The Pacemaker was made after the Anniversary model, in the late 40's and 50's. So, pre-anniversary and anniversary Graphics are not likely to work because they usually don't have a Graflok back to accept alternative film holders like the Fuji/Polaroid.
Rick "who has a Pacemaker Speed Graphic set up for similar purposes" Denney
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