Reddit reviews CRL Aluminum Wrap Around Door Shoe With Vinyl Weatherseal for 36" Door - DB054AV36
We found 2 Reddit comments about CRL Aluminum Wrap Around Door Shoe With Vinyl Weatherseal for 36" Door - DB054AV36. Here are the top ones, ranked by their Reddit score.
Official C.R. Laurence Product
something like this might not be pretty, but does the trick the most effectively.
Not sure this particular one would work aesthetically for you, but there are definitely door sweeps made for doors that have been undercut too much.
Door extender