Well, there is. In the Flypad, you can set the MSFS Flight Plan Sync to none. In this case, whether you make your flight plan from Littlenavmap or simbrief, you can load the .PLN file on the MSFS world map, without it messing up the FPLN in the MCDU. That way, your default ATC and the VFR map will still use the exact same flight plan, while the MCDU is indepently following the same flight plan.
This is how I always do it for months, even now:
- Create SimBrief flight plan.
- Download the FS2020 .PLN file from Simbrief to my PC.
- On the MSFS World Map, I LOAD the .PLN file.
- Select the starting gate and the destination approach from the drop-down menu (so the flight plan stays intact and doesn’t get refreshed).
- Start the flight.
- Use the MCDU to INIT REQ the flight plan down from SimBrief.