Actually, yes, that should help. All we need in that case is a list of all the types of stations that are mobile, which I'm willing to bet consists of only Mega Ships and maybe one or two other types.
EDIT: Yeah, I'm pretty sure it's just the Megaships:
"type_id":1,"type":"Civilian Outpost"
"type_id":2,"type":"Commercial Outpost"
"type_id":3,"type":"Coriolis Starport"
"type_id":4,"type":"Industrial Outpost"
"type_id":5,"type":"Military Outpost"
"type_id":6,"type":"Mining Outpost"
"type_id":7,"type":"Ocellus Starport"
"type_id":8,"type":"Orbis Starport"
"type_id":9,"type":"Scientific Outpost"
"type_id":11,"type":"Unknown Outpost"
"type_id":12,"type":"Unknown Starport"
"type_id":13,"type":"Planetary Outpost"
"type_id":14,"type":"Planetary Port"
"type_id":15,"type":"Unknown Planetary"
"type_id":16,"type":"Planetary Settlement"
"type_id":17,"type":"Planetary Engineer Base"
"type_id":19,"type":"Megaship"
"type_id":20,"type":"Asteroid Base"
I wonder what happened to type_id 10