I looked on the Meade website and it says "Out of Stock" on everything with the X-Wedge. Looks like tripod and all are different, compared to the LX 600 12 inch without the X-Wedge. I am not sure if out of stock just means they are sold out of those until they make another run of them, or if it means they have really been discontinued.
I am sure you could have something machined to turn the regular LX 600 12 into an equatorial scope, but I do not see anything as a direct replacement for the X-Wedge arrangement. The best bet is to call Customer Support and see if they have a recommendation or information about another production run of that scope setup.
That sure looks like a wonderful setup and I hope you can end up with one or something really similar.