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Posting this here to get updated on when Litematica gets updated to 1.19!

Yes I would love this mod to be updated!

There is a community-maintained port for 1.19: https://kosma.pl/masamods/

These maintainers seem to want the best for Masa and seem to genuinely support them. They link to the original mod page, they've open-sourced their ports and they seem to have ported a good chunk of Masa's mods. I don't know what Masa thinks of this, but these ported mods seem to be a good temporary replacement until Masa finishes their brilliant work