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So basically you want a buckboost type thing to go from solar to batt with output currnt control(?)

Easy cheap way is to just use uncoupled SEPIC and regulate the output currnt.

You know how to regulate output currnt?

(if not i show you in LTspice sim?)

SEPIC no high side fet drive

SEPIC no high side currnt sense.

This is why i say SEPIC.

incidentally what kwh is the battery?

How many solar panels  and of what power they are?

On the other hand........

If you dont need the solarBattery to be grounded to system ground, then why not do a BuckBoost_with_load_referred_to_vin?

This is a very simple buckboost with simple  low side fet and low side currnt sense, but the load is referenced to vin.

This could be a nice simple way for you. Add in the solarBattery current regulation and you're done.