Is it possible to run matrices from Workbench / Mosel?

Not directly, but you can use the Optimizer command of the module mmxprs to work with the Optimizer Console from within Mosel. In this case there is no problem representation in Mosel, but solver controls and attributes (setparam and getparam routines on "XPRS_" parameters) and simple (logging) callbacks can be used. If needed, a Mosel program can parse solver output files (see Appendix 'Log and file formats' of the Optimizer Reference Manual) to retrieve information into Mosel.

• Loading and running a matrix file in LP or MPS format, reading solver CSV output files into Mosel (runmat.mos)
• Callback definition when running a matrix file (runmatcb.mos)
• Setting solver parameters via the console command (runmatparam.mos)

CUTSTRATEGY=0
HEURSTRATEGY=0
PRESOLVE=0