Not sure of relationship location of the two different panels.
If side by side, then can drill a hole in lower section of each panel between each other, they make pop in wire connectors that you could add from the inside to lock the new piece of wire to the box. Then do a spice in non-inverter box to the wires to the basement.
In looking at the pictures I think it would be easier to remove one of the boxes and with a short piece of 12/2 romex push in the back of each of the panels. Then make a spice in the non-inverter box of the basement wires.
The breaker for the basement is not a cheap breaker so you would move that to the other panel. They make filler plates that you can get at Home Depot that would then go on the panel cover over where you removed the breaker.
Before you start working in a the breaker boxes make sure shore power is disconnected, inverter(s) turned off, and generator auto start turned off.
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2014 Foretravel IH45
Houston (Cypress), TX.
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