I was wondering more along the lines of the wall sockets rather than the adapter.UGREEN Car Charger 69W USB C PD Car Adapter 3-Port Cigarette Plug Compatible with iPhone 13 Pro Max/12/12/11/XR/X, iPad Pro/Air 2/mini, Galaxy S21/S20, Redmi Note 10, Pixel 6 etc https://www.amazon.co.uk/dp/B094DFW7T7/ref=cm_sw_r_apan_glt_fabc_50PN7CP8PTSP4GDYRNJ6
If it's possible to install a twin USB socket powered by the leisure battery, that could provide 40W+ fast change, that would be perfect.