You might do well to find a 10+ year old Dell or HP desktop. Depending on the hardware and software compatibility you need and area you live in, you should be able to find such devices inexpensively or even free as e-waste of public schools or old business machines.
I have collected several Dell Optiplex 780, 790, 9010, 9020 and they all work well with booting DOS from USB drive as a starting point. These machines can switch between UEFI and BIOS boot mode and you can find DOS drivers for their built in sound and Ethernet hardware. Their BIOS is also well suited to boot from USB drives and adapters.
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