We are happy that we could help our collabotation partner Marcel Leist in answering the title question by the application of metabolic glycoengineering.
Dave's and Bjarne's paper "Carba-Sugar Analogs of Glucosamine-6-Phosphate: New Activators for the glmS Riboswitch" is available online. See: doi 10.1002/chem.202202378