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You may already know this but getting 12V out of a 15V PD is relatively straightforward with either a linear regulator (less ripple but less efficient) or a buck converter (more ripple but more efficient). The Internet is full of very inexpensive boards that do all that.

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Yeah I'm usually doing one conversion already (think 12v fan + 5v/3.3 esp32) so ideal case for me is pull 12 for the fan since that's the bulk of current and convert that down for esp/pwm but many ways to skin that cat I suppose.

I have discovered that certain Anker chargers are happy to supply 12V PD though...and it tends to be their cheaper charger lines. e.g. A2149 while the more expensive ones refuse 12V requests

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