Aha, that's perfect, Roger!

Digging more, I find out I can also filter results I'm searching for with the WMIC SQL Query Language, such as:

wmic path Win32_SerialPort Where "Caption LIKE '%Arduino%'" Get DeviceID
wmic path Win32_SerialPort Where "Caption LIKE '%GPS%'" Get DeviceID

Those will return the exact COM port ID of the things I'm looking for. FANTASTIC! Thank you!
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Tony Fabris