creating ifs fixed length text file with unusual requirement

Creating fixed length (801) ascii txt file with LF in 802 but requiring
last row to have no LF.
This is not a written requirement but their workaround after state
government agency I'll not name implemented a new web portal (old portal
upload worked for 10+ years, New portal breaks as its failing looking for
next record that does not exist.
I'm only assisting to fix issue.
File created CPYTOSTMF UTF-8 and rows added with CPYTOIMPF

I could build a RPGLE pgm to remove last row LF, but is there a script way
of doing this that can execute from clle? Not too familiar with script
except sftp processing. V7R5

Thx
Jim Franz...