Good news: the excellent VisiData (https://www.visidata.org/) supports USV.

Bad news: it looks like they got ␟ and ␞ mixed up, there are trailing ␞␟ characters after each record (should just be an ␞ between each record), and no characters at all after the last record:

    $ cat test.csv
    one,two,three,
    four,five,six
    seven,eight,nine
    $ vd test.csv -b -o test.usv
    opening test.csv as csv
    saving 1 sheets to test.usv as usv
    Think about what you're doing.
    test.usv save finished
    $ cat test.usv
    one␞two␞three␞␟four␞five␞six␞␟seven␞eight␞nine␞␟$             
    $