Not that I'm aware of.  Once you start down the path to the dark side, forever will it dominate your destiny.

Make your updates in FAM 2018 to match what you did in PS 2018.  Then roll FAM 2018 to FAM 2019 and close the year.  Make any 2019 changes (new assets, sold assets, etc.) and export FAM 2019 to PS 2019.

Once you have assets in FAM you have to export/import every year.  ProSeries is "smart" enough to know that the assets were imported last year so it will not roll them over to the new year (it assumes you're going to update FAM and export them again.)

Rick