It's not possible with the Orion, you can with these but they are 3x more expensive: https://www.victronenergy.com/dc-dc-converters/buck-boost-dc-dc-converter-25a-50a.
The smart version can limit current based on input voltage. I have a 20A one between a FLA and LFP battery. FLA gets charged by alternator or AC charger (15A) and when the voltage is high enough (14V) it will start to charge until it reaches V_shutdown (mine at 13.1V) on the input side.
This...