I just found out the work presented via the virtual meet-up presentation Bringing together language workbenches and macro systems by Michael Ballantyne, evolved into a short paper in honor of Eelco Visser who died last year: Eelco Visser Commemorative Symposium : Ballantyne, Felleisen
Injecting Language Workbench Technology into Mainstream Languages, with a longer version of this is in the works.
Stephen