They seem to have some sort of experimental support for GTFS [1], and one important part of Transitous is being a GTFS aggregator, so maybe they are not too far away from being able to use that part of Transitous.

Although it'd probably be good to be able to query Transitous itself when online.

[1] https://github.com/organicmaps/organicmaps/blob/master/docs/...