With Bruce Wayne recently being referenced in the Arrowverse for the first time, it’s certainly feasible that a Clark Kent Easter egg could find its way into Gotham.
Gotham recently aired its winter finale episode and Mazouz’s young incarnation of Bruce Wayne is heading down a decidedly dark path.
Or, if the writers wanted to get creative, Clark Kent could take a boat ride over across the bay to Gotham and create a young friendship with Bruce Wayne I think that would be even more cool…
Another frequent ally of Bruce’s is, of course, Clark Kent and not always just because their mothers have the same name.