Combining in a HU361 disconnect

SolMan

I want to use a Square D HU361 DC disconnect as a combiner for 3 12 volt strings.
I want one set of conductors coming out to my Prostar which can only take one string.
Since this is a 3-pole switch and I can only double-lug the poles (not triple-lug), can I do something like this, or is this a silly idea:

2 strings come into pole #1, single wire out and circle back into pole #2.
1 string goes into pole #3, comes out and goes back into pole #2.
Pole #2 outputs a single, larger wire to the Prostar.

10 AWG in. 6 AWG out to Prostar.

Am I nuts?