Is it possible to change the default buttons that appear in the Border
drop-down box/Border floating menu?

There are some default buttons I've never used, such as the double line on
the bottom with the single line on the top.

I'd like to be able to remove these buttons I never use and replace them
with buttons for borders that I use a lot, such as diagonal lines running
from corner to corner forming an X though the cell.

Or maybe just to change the weight of the line that makes up the border
without having to right-click, select borders, redraw the border, and then go
back to the worksheet.

Is it possible to do this so my custom borders can be placed into the Border
Menu/Drop-down Box?

Oh, BTW, it seems I can add certain single lines to the menu using Tools
Customize Commands, but those lines each have to be drawn individually and
they don't appear in the "Auto border button" next to the drop-down arrow.

Any easy fixes?