First, nice project. I've already struggled with pixi-display-live2d for a while, never seen someone trying to implementing new one, and yet I don't have enough time to start or fork on the pixi-display-live2d to fix everything correct onto the right track.
I see that packages/cubism is just a embedded version of https://github.com/Live2D/CubismWebFramework with additional !!node && guard introduced in since 384e131.
Is that possible to include the Live2D/CubismWebFramework as a Git Submodule, while this may introduce extra steps for CI/CD pipelines and workflows in development environment, perhaps, referencing it with pnpm's Git source provider with pnpm patch could solve the problem once for all.
If suitable, I could help with it.