The big "con" is around 5K in pricing when looking at the 40kg class. You can get an iOptron CEM120 for 5K. The encoder versions of that mount is now about 8K. And those aren't even absolute encoders. Last time I checked AP was charging around 5K for the encoders on the AP1100 or the AP1600 (I didn't look it up today.) The GM2000 costs about 5K more than my MX+ with roughly the same weight capacity. So, there's that to consider.
Since the OP wants to spend 10K use and have absolute encoders, the only way out to support a full 40kg is, as dhaval pointed out, a used mount. Forty kg is one big system! Frankly, I can't imagine putting a system 8000km remotely from my house and expecting it to run without someone knowledgeable on site.
All of the observatory class mounts have a way of recovering from power outages, being moved when turned off, being bumped, etc. It's just that having absolute encoders is by far the most elegant solution. I use an enormous RC25 which has no clutches and requires two people to park it if there is no power. If it happens to stall or we have a power glitch, it is enormously reassuring that the renishaw encoders know exactly where the scope is pointing. I just tell it to "park" to make sure that all is well and then go back about my business. It's been this way since the encoders were installed 6 years ago.