How to customize lock screen wallpaper after iOS 16 update

i just updated ios 15.7 to 16 and would like to customize my lock screen/wallpaper, eg. choose a different, less bold font for the date & time.

however, trying to customize my current wallpaper only gives me the option to add a new wallpaper. neither directly from the wallpaper (by holding it), nor from settings > wallpaper > customize i can customize the current one, it only gives me the "add new" option. and adding a new wallpaper cannot "copy" or port the current wallpaper as a template to a new one to start from. my current wallpaper being my original apple one back from the iphone 4s or so, i neither have it saved as a photo in my photo albums.

so 2 questions:

• is there a way to customize my current wallpaper despite pressing the customize button only gives me an option to add a new one, resp. if not - feature request or bug fix for an upcoming ios 16 update: please add the possibility to customize the ported wallpaper from previous ios versions
• if the above doesnt work or they dont make it possible soon, how can i access the picture from my current wallpaper in order to add it to a new wallpaper, if the picture is ported from an old ios, ie. not a custom picture or photo located in my photo albums? there is no "apple wallpapers" folder anymore in settings > wallpaper that used to store original ios wallpapers

thanks

[Re-Titled by Moderator]