All of those technical problems are soluble with the application of skill. There are plenty of talented experts who have been solving problems of exactly this magnitude for generations -- and doing it so invisibly that you don't even realize they were there.
Consider the Dinosaurs sitcom from the '90s. Every performer in that show was constantly walking around in a heavy rubber suit topped in a massive animatronic head with radio-controlled servos moving the eyes, lips, and facial expressions and being operated in real time by one or two puppeteers. And they managed to do this on a regular basis for 65 episodes. What I'm proposing would be a much simpler and lighter rig, since I'm thinking it'd be mostly rod-puppeted or cable-controlled so there'd be less need for servos and power packs. Although today's servos and power packs are probably a lot lighter than what they had in the '90s, so a radio-controlled rig might work too. People don't realize it because of the obsession with CGI, but the state of the art in animatronic and puppet FX has been improving steadily right alongside CGI. Have you seen the behind-the-scenes video from The Last Jedi showing all the practical creature effects they're doing? The skill is there.
As for the rod and wire work involved, it wouldn't be that much more difficult than the wire work they do every week on Supergirl to make Melissa Benoist fly. She's strapped into a tight, uncomfortable harness, there are a bunch of stagehands pulling on ropes to lift and maneuver her through the air, sometimes there are even people puppeteering her cape so that it moves the way they want it to. Again, this is something they pull of on a weekly basis, and it doesn't impair Benoist's ability to perform, because actors are not fragile and are capable of rising to challenges.