Based on Shanghai, it seems the shows not running are more due to live performers not being able to social distance back stage than having an Audience.
Now 3D shows could still take place, but with castmembers handing out the 3D glasses in a way that guests never touch the CMs' gloves.
So. Muppets could still take place with reduced capacity.
Frozen Sing Along could also still work, as there are very few performers, so backstage social distancing would not be an issue and the theater is huge, so reduced capacity not an issue.
Similarly, the Indy Stunt show could also still take place for similar reasons and that it is an outdoor theater.
Given the numbers, Beauty and the Beast would be harder.
Fantasmic has many modifications that can be made, including reducing the number of live performers, so while unlikely (from a cost perspective), it could be done.
We already know they have said Little Mermaid will not be reopening for other reasons, so that was out regardless, sadly.
Disney Jr would be problematic on many levels.
Launch Bay at Hollywood Studios also wouldn't really work