There are a few issues you’ll have to deal with in order to do that. If using Mendix cloud to deploy you might have to make your entry point available for access (i.e. /(abc)/). You do this within Sprintr by going on Environments, going in your environment’s details under Network in the Path Based Access restrictions section:
Secondly you would have to edit the request handlers in the OAuth module to listen to that particular path rather than the default /callback/.
Hope this helps.