Nevermind, I went ahead and just got this https://www.amazon.com/dp/B07N18XN84?psc=1&smid=ASQ82QWPDLFS4&ref_=chk_typ_imgToDp

Hopefully I can dial the voltage up as needed without something bad happening or needing some special Waveshare board pin, ha.

Just as options...

If you have an extra PC power supply, you could use something like this (and you could use it to power other stuff in the future):

https://www.amazon.com/gp/product/B01NBU2C64

Or something like this (or one with a 12v only output):

https://www.amazon.com/gp/product/B07N18XN84

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Good luck

Had a similar issue a couple weeks ago and picked this adapter up on Amazon. Its not as snug of a connection as the OEM model but it works.

amazon.com/dp/B07N18XN84?psc=1&ref=ppx_yo2ov_dt_b_product_details