Switch MPPT Charger between Starter and LifePo4 Storage Battery

Hey,

i use a MPPT 100/30 (with Bluetooth) and a 440WP panel to charge my LifePo4 Battery.

I just had the Idea to also charge my Starter Battery using the Solar Panel, because my Car Stereo which i use a lot when standing uses a lot of power.

If i add a switch, how can i tell the MPPT Charger to also change the Charging Cycle from LifePo4 to Lead Acid Battery. Is there an easy and cheap solution?

Thank you in advance.