Travel Charger with:
* dual input 12V DC & 120/240 autosense
* swappable international plug adapters (nice to have, not essential)
* 4 output ports, with at least 1 or 2 USB-C
* current QC / PowerIQ / USB-PD standards.
roughly the capacity of PD+ 4 port. Maybe 40-50 W on 12V DC and higher output on AC.
Offer this with a "pick your own cable bundle" from the ideas above, and let the buyer choose "2 to # of ports" cables of differing connector types, lengths, and colors.
Pricing for the charger under what a car + wall / desktop charger pair would be. I could see myself buying the wireless tower multiple pad idea above, with additional charging ports in the base for home, combo charger for car & travel, and office multiport wall.
Credit to @mattgold018 and @Albert_DK for multi-input, and high-power ideas. Apologies for not noting the "Tower of Wireless Power" author and the cable bundle author.
Avoid integrated cables. If they break, the port capacity is lost.