> Unfortunately I didn't see any sequences that do this. Anyone have any ideas?

Assuming you tried moving the cursor vertically, have you tried the alternative approach of Store Cursor Position / Restore Cursor Position cf https://stackoverflow.com/questions/28986776/ansi-escape-seq...

The scrollback buffer may be a limitation, so you should try with enabling or disabling the alternate screen (ti/te)

If that fails, you may have to tweak your terminal emulator to "hook" the SCP/RCP to a specific point of the scrollback buffer, to allow this scrollback.