It looks like it would be possible, this company sells a single GPS units, with different cables to connect to various controllers.
http://www.stargps.ca/
The sysnscan official GPS unit is actually made by Unitraq and uses the standard cheap GPS chip.
Sysnscan had them make one with custom firmware, the damn thing should be about $40.
http://www.unitraq.com/product.php take a look at the 'mouse' type.