The problem is the chip shortage is impacting the BIM160 as well. I would contact Precision Circuits directly and ask them for lead-times and whether they know of any of their suppliers who may have stock.
If you are sure you really need a replacement unit, you might want to look at a DC-to-DC charger. Something like this one.... but you would lose the ability for the converter to charge the chassis battery.
https://www.renogy.com/12v-dc-to-dc-...ttery-charger/
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