A thing you have to factor in here:
Tuning the Lunt will put rather a lot of (assymetrical) force on the OTA and mount....one should be able to test it wether you don't throw it of target while doing so on this mount.
As for the solarquest muont by Skywather mentioned here already: I use one with the Lunt 50 and it is a wonderful combination. very light and compact. It indeed autpoints to the sun and tracks very well without any polar aligment of the mount. It is put down and go. You also don't need a couterweight, another weightsaver.
Disadvantages:
1. You'll have the problem with the scope going off target while tuning, but the advantages of light weight and autopointing+tracking make me happily live with that.
2. You really have to invest in a sturdier tripod than the one delivered standard with the Solarquest: The standard tripod will bend under the force of tuning the Lunt. Even without tuning it is marginal and frustrating to use. The half pillar on the other hand is a good piece of kit.
As for the Alt-Az aspect: I tested it with vids of 6000 frames (not gone further than that) @ 30FPS and the field rotation can still be handled by AS3
As it is the Solarquest is very good and well priced for what it does, but I'd like to see an option where you can control centering the solar image in the sweet spot of your scope from an external device and not on the mount.