My suggestion is to try to present the result in a conference first. In some fields (not sure if that's true for yours) the bar for getting into a conference is lower to some extent; and even if that's not true, a conference organizers may be more inclined to have a "weird stuff / odds and ends / couldn't fit this anywhere else" session. Maybe even try to get it in as a non-refereed paper, i.e. as an invited talk - that would mean contacting the organizers rather than the program committee, or both.
When this happens, you might be able to attract enough attention to increase your chance for a journal publication.
This is not to detract from the fine suggestions in @Wrzlprmft's excellent answer.