Hi,
1) Does anybody know of any scientific publisher or single journals which accept papers/book chapters typeset in ConTeXt yet
I will use ConTeXt to typeset the Jewish Studies journal *Judaica* (https://bop.unibe.ch/index.php/judaica/index). (The first issue should appear soon.) However, we do not accept ConTeXt sources as we use jats xml as our production format. (Actually, I don't expect any of our authors is using ConTeXt.)
2) If there are any is any of them convinced enought about ConTeXt to recommend use of ConTeXt or even provide template?
Yes, I gave two talks last year at the Public Knowledge Project Conference in Barcelona. One was about our general workflow (going from docx via pandoc markdown to jats xml; the other was about typesetting xml with ConTeXt.)
3) What would be needed and what could help to make them aware? (difficult to properly formulate, if unclear dont bother)
Don't know. Perhaps more examples? Best, Denis