I don't know how it would affect the computer, but physically I don't
see why you wouldn't be able to switch to a solid sway bar.

Several months back, there was a brief period where the new JK Rubi
electronic disconnect bar was priced wrong, and several people bought
them when it was discovered that they were almost a perfect drop-in
replacement for the YJ's solid bar. I ordered one, but the supply ran
quickly dry and DC realized the pricing mistake before I got one, so
they canceled my order.

Going the other direction, from an electronic disconnecting bar to a YJ
bar should be dirt cheap, if you can find one in a bone yard. :)