The 1.8x looks promising, but I do think 4:3 and other "square-ish" ratios will be available in the future. The other thing to consider is that people will still use film (16mm and super 8 will come back for short form productions). Non super 16 cameras and super 8 cameras would require the 2x compression. Super 16 could still benefit from 2x since you could safely frame shots without worrying about dirty edges (digital guys scratching their heads right now).
I think 1.8x would definitely work in the short term, 2x would be future proof (since you cannot change the history of anamorphics).
But if you're going to do 2x you can skip the multicoating, or just do a single coating like the old lenses. It has to flare. We can buy flags and black wrap and learn to control light better.
Finally, there is one lens artifact that I have not seen reproduced by any "ownable" lens, and that is the prominent circular red halo around light sources (eg. The Thing (1982)). I can only guess that it is some internal relection/refraction in the spherical optical block behind the anamorphic, but maybe you can explain what it is and if it can be duplicated.
I bought one of the very first speedboosters for my pocket camera, so I am very excited to see what you will come up with.
speedbooster is a lens behind the taking lens which concentrates light into a smaller area, anamorphic is in front of the taking lens, so it doesn't get more light into the lens, just a wider horizontal fov.