The astrotrac is reputed to be very good for an unguided platform, although the new version has a guiding port. The cost escalates with accessories, but if you don't need them it's an effective relatively inexpensive solution.
Preferably you need something that is rigid and motorised. Keep looking, there are smaller motorised mounts made by Vixen that might suit your purpose.
I can hear the groans, but have you considered a motorised double-arm-drive. For your application, it may be all that you need.
Other types, such as the iOptron Cube are OK for short exposures under 54 seconds and double as an observing platform. Some of the earlier models convert to an equatorial mount and are not too costly - and probably available second hand at very low prices.
All depends on how much you want to spend.
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