Vincent,
It sounds like you’re saying that Scrivener’s built-in Scratchpad doesn’t retain the desired attributes.
Perhaps dumb question: Would copying from Scrivener project A to Scrivener project B give you want you want?
If so, try out AmberV’s Scratchpad project. It’s a Scriv project configured to look exactly like the Scratchpad.
I believe he uses it as a substitute for the built-in version. Hopefully it works for you.
Best,
Jim