You could just remove the 314 and then just add the 380 and/or 385 along with the 314 as bonus stock if GCC doesn't add rolling stock DLC
https://forums.dovetailgames.com/threads/route-linking.40393/ A way of linking with Cathcart Circle, maybe?
The best way to make money for this route is bundle this with Cathcart Circle as the Glasgow Commuter Pack.