That's a good idea! I have a Eastern Beaver PC8 fuse box that I have been wanting to install; but it would not fit nicely behind the left side battery cover area... quite possibly it's too thick for the location you just described... but I am going to check it out.
I have the one with the 18" leads... I would need to extend it further though
Eastern Beaver makes great stuff. Check them out:
https://easternbeaver.com/Main/Wirin...PC-8/pc-8.html