I think that we should adopt these “polite triangle” conventions for how joseki are oriented in the solution set. I believe the OJE follows these conventions with how the joseki tree is stored.
However, I don’t think that we should restrict inputs to follow the polite triangle conventions. As @antonTobi just mentioned, while I was typing, there could be strategic reasons to input a “flipped” joseki. When following the conventions, some joseki wind up more unbalanced toward one side or the other of the main diagonal, so sometimes one might want to input a flipped joseki to better probe.