[GNC] Merging multiple .OFX for import

[Jeff Albrecht]

It's time for me to do my annual mass import of .OFX from my various 
financial institutions, and vendors in preparation for tax return 
creation. In the past I have imported one .OFX at a time from each 
account, checking, savings etc, at each specific bank correcting and 
matching as necessary. One pain point I often experience is matching 
transfers between accounts at each bank. Often what seem obvious matches 
are missed or, probably through my own attempts to resolve, result in 
duplicate entries.

I'm considering merging each individual account .OFX at one bank before 
importing that single merged .OFX representing all the accounts for a 
given single bank. Hoping in the long run to save some time matching and 
increase accuracy by the importer having all the data at one time.

I saw this email about the subject but have not found the subject in the 
GNUCash documentation. 
https://lists.gnucash.org/pipermail/gnucash-user/2020-March/089825.html#:~:text=Messages%20sorted%20by:%20%5B%20date%20%5D%20%5B,can%20import%20OFX%20files%20with%20multiple%20accounts.

Will it be worth my time to merge multiple account type .OFX files into 
one .OFX representing all ofx for a given bank merged file for import?

what about merging all accounts from all banks into one merged .OFX file?