The scanning of the model will be one challenge. You'd have to find a hobbyist with a quality scanner, or someone using photogrammetry to do the conversion from multiple photos to digital model.
Beyond that, it's a less difficult task to find someone with a printer capable of the size required. Of course you'd have to consider that the model scan/digital conversion is a location-based process. If you find a model in the eastern part of the country and your resource is in the western part, there's travel costs. All of these factors are able to be solved.

I've attended a maker faire at which one booth was scanning cosplayers using a 3D scanner mounted on rails. One button push and the turntable rotated, while the scanner moved vertically. The resolution was lower than you'd want for a model head, but it's an example of the home-spun level this technology has reached.

Perhaps you can cast about in your area for makerspaces to see what resources are available.