tl;dr: Altran’s Xtext / Sirius Integration provides the full Xtext experience for Sirius direct editors (a.k.a. pressing F2 in diagram) and properties editors. It’s highly configurable, well-documented, and released under EPL 2. I’ll present it at EclipseCon 2018 next week in Ludwigsburg. We intend to contribute this to the Sirius project.