Dear Tom,

Although this may not be of help in the current context, as one example, OUP does allow authors contributing to SSJJ to include "additional materials"
in its *digitally* published issues of SSJJ.

We are just beginning to consider how best to use this service. In our last exchanges with OUP Tokyo, we discussed the inclusion of 'other media' such as photos, video and related material that can digitally serve as a complement to the published SSJJ article.

As such, it may be worth pursuing this with Routledge.
It is possible if they choose to offer the service.

Best,

Jackie Steele
SSJJ Managing Editor
Assoc. Professor, ISS, University of Tokyo