It is possible to share variables between a PLC with SoMachine/Machine Expert protocol and Vijeo Designer standalone, all need to use is the driver PacDrive-Ethernet / PacDrive LMC x00C.
Please find in attachments a complete guide that explains all the steps.
Important:
Some variables types like structures are not compatible, use this driver only for sharing basic variables types: BOOL, INT, WORD, etc.