I also Like DIY but at this time and Age, getting a 30W type C USB-PD charger, 30W Type C USB-PD powerbank, and a type C 12V activator/adapter woukd be My way to do it. Easier to replace by buying an over-the-counter replacement. That way I can also instruct someone else to buy and replace stuff Without me. It gets tiring to fix things yourself because people dont Even recognize basic electronics. And I can use a 15V type c adapter or 5V for other Network equipment Like an Asus router or a low-power tplink switch.
Another way would be a fast enough charger, to a powerbank that can do passthru, and a dual-head 5-to-12V2A adapter.
But still pretty cool. I remember Building a powerbank Full of AAs and a Couple of LM7805 to give 5V2A to My PSP. Good times.
