(Not endorsing any vendor listed below)
I feel like you may have missed the past 5-10 years of activity on this front? Digital humanities is a well-established field with lots of active participants.
CrossRef has TDM support (http://tdmsupport.crossref.
Maybe publishers on the list would like to point you to their help pages.
Christina
From: kalev leetaru <[log in to unmask]>
Date: Wed, 20 Jun 2018 14:53:30 -0400
Thought many of you on the list would find of interest my latest piece, which summarizes a number of thoughts, comments, situations and ideas I've heard from both the academic and publisher worlds regarding the state and future of publishers supporting TDM:
Would be very interested in hear offline from publishers on this list as to any TDM offerings they currently have, ones they are planning or considering launching or past offerings they shut down and why.
Kalev