Thanks @marqh for the projinfo tip.  I found that you could enter

```
projinfo EPSG:3408
```

to get this (with some IDs removed). Maybe that's what you were referring to 
regarding proj's own adapted WKT.

````
PROJCRS["NSIDC EASE-Grid North",
    BASEGEOGCRS["Unspecified datum based upon the International 1924 Authalic 
Sphere",
        DATUM["Not specified (based on International 1924 Authalic Sphere)",
            ELLIPSOID["International 1924 Authalic 
Sphere",6371228,0,LENGTHUNIT["metre",1]]],
        PRIMEM["Greenwich",0,ANGLEUNIT["degree",0.0174532925199433]]],
    CONVERSION["US NSIDC Equal Area north projection",
        METHOD["Lambert Azimuthal Equal Area (Spherical)"],
        PARAMETER["Latitude of natural 
origin",90,ANGLEUNIT["degree",0.0174532925199433]],
        PARAMETER["Longitude of natural 
origin",0,ANGLEUNIT["degree",0.0174532925199433]],
        PARAMETER["False easting",0,LENGTHUNIT["metre",1]],
        PARAMETER["False northing",0,LENGTHUNIT["metre",1]]],
    CS[Cartesian,2],
        AXIS["easting 
(X)",south,MERIDIAN[90,ANGLEUNIT["degree",0.0174532925199433]],ORDER[1],LENGTHUNIT["metre",1]],
        AXIS["northing 
(Y)",south,MERIDIAN[180,ANGLEUNIT["degree",0.0174532925199433]],ORDER[2],LENGTHUNIT["metre",1]],
    ID["EPSG",3408]]
```

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