If you buy the pv350d, you need 2 panels to put them in series to be able to properly recharge your ac200max.
And if you have an unlimited budget! and also want to reuse your 2 pv350 panels with your two new pv350d panels, you Can buy 2 bluetti d050s.
Then connect them in this order (this is the only optimal combination in your case):
-the two pv350d in series on the solar input of the ac200max.
-one pv350 panel on the input of the d050s, and you connect the dc7909 output cable of the d050s to the ac/dc adapter input of your ac200max
-one pv350 panel on the input of the d050s, and you connect the dc7909 output of the d050s to the ac/dc adapter input of your b230.
So at most you will have 1400w of solar to power your av200max + b230.