I actually have a crazier idea, write a powershell script to synthesize new images directly through commands, skip opening the editor, almost plug and play
Of course, this may require installing imagemagic beforehand
In short, I hope you can make boxart templates for other tools of the RPG maker developer, such as PGMMV, RMMZ, RMU, and VNM.
But in the itch community, maybe one should be made for itch, the popular GB Studio, renpy, pardon my rambling, it would work great.