Steve, very NICE camera! Never seen one before... I've used Maximar-type 9x12cm plate cameras with 13.5cm lenses, and was able to guess-focus most of the time, but a telephoto would be challenging. Regarding the ease of use for reportage, there were 9x12cm film packs available that held ten or so sheets, which would have been much faster than single-plate holders.
Does your FP shutter still work? I've read that the German-style LF focal plane shutters don't seem to hold up as well as the Graflex. There are at least four or five slightly different types of 9x12cm plate holders: wonder which one yours takes? Hopefully it's the most common type which fits the Maximar/Avus/Reccomar models.