I used my AZ-GTi in Alt-Az with my Lunt LS60MT in single-stack and it was OK. I then changed the mount using a wedge and counterweight and, while a bit more wobbly due to the added weight, it was still pretty usable for lucky imaging. I then added a double-stack, which weighed in at 2 lbs and meant more CW as well, and it was very wobbly and clearly overloaded. I think most of the issue was the tripod but it was clear the mount was struggling as well under the weight. It may have been more or less OK in Alt-Az but still would have been beyond the posted limits of the mount.
My other option was my G11 but that seemed like overkill so I bit the bullet and pickled up an iOptron GEM28. So far I'm happy with that choice as I use 3 different dedicated solar scopes (LS60MT, ST80 w/Quark, Lunt CaK) with it and it allows me to do time lapses. I did upgrade the saddle with an ADM as I felt the stock saddle just didn't provide enough clamping area.
What camera are you going to be using as it seems like a fairly low frame rate? You may also want to post/move this over to the Solar Observing & Imaging forum for more feedback.