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Just FYI that open-source SpliX driver supports all these previously unsupported printers in git master.
https://github.com/OpenPrinting/splix/tree/master

Xerox Phaser 3020 and WorkCentre 3025 code is available in xerox-3020 branch.
If anyone willing to test it, please report back, I'll merge it into master and make a release.
https://github.com/OpenPrinting/splix/tree/xerox-3020

bchemnet, take a look at HP 107 drivers. This is a new HP device, but it is made on the same hardware and software platform as Samsung Xpress SL-M2020 and also uses SPL with uld driver.

The latest driver available for this device is V1.00.39:00.12_00.15 from Jun 26, 2020. The archive includes i386, amd64, aarch64 and mips64 binary libraries.
https://support.hp.com/us-en/drivers/selfservice/hp-laser-100-printer-series/24494339/model/24494342
https://ftp.hp.com/pub/softlib/software13/printers/CLP150/uld-hp_V1.00.39.12_00.15.tar.gz

The configuration files are all stripped for HP, but I won't be surprised if it would work with Samsung printers by just copying oem.conf and smfp.conf from the Samsung uld.