Forgot password on Samsung Galaxy S7 Edge, trying to access for Google Authenticator

I never wrote my password down for my old S7 Edge and managed to forget it. Overthinking the security and privacy, I also never signed up for Samsung's service and Google's Find My Phone only recognizes my current phone -- so I can't use those online services to reset the password. I'm wondering if there's a super-user method to get into the phone (or extract data) ***without wiping the data with a hard-reset***. In the Android Recovery screen (volume-down, home, and power buttons held simultaneously), I have the "Apply update from ADB" option but sideload seems to be the only functionality and the handshaking seems wrong. The resulting messages on the Android are:

Finding update package...
    Opening update package...
    E:footer is wrong
    [...]
    E:signature verification failed

I found online somewhere that the password file for the phone model is in

/data/system/gesture.key

and

/data/system/gesture.key

would be *ideally* what I'd like to bring about. However, I can't use a command such as

shell

on it without the password. I also haven't figured out a way to inject and run a script (particularly with the handshaking and with adequate privileges for the phone) with that

command using

sideload

. More details or seeming dead-ends: - The phone was not rooted. - I'm *fairly* certain I enabled USB debugging. - It's a SM-G935W8 (Canadian) model with hero21tebmc (firmware?). - Samsung's Smart Switch software is also not an option to transfer data (w/o knowing my old password). - The third-party software I've seen and tried on a friend's Winwoes laptop doesn't have the password-reset capability on the S7 Edge... it would work if it was an S6 or older unfortunately. - the Android Recovery screen has other options including: "Apply update from SD card", "Mount /system", "Wipe cache partition", and the dreaded "Wipe data/factory reset". - I'm using a Linux distribution (Ubuntu 18.04) and would use heimdall on the command line (instead of the Odin software). These links, [Official TWRP for Galaxy S7 edge (hero2lte)](https://forum.xda-developers.com/s7-edge/development/recovery-official-twrp-hero2lte-3-0-0-0-t3334084) or [Flashing Firmware on Linux/Ubuntu using Heimdall](https://forum.xda-developers.com/s7-edge/how-to/guide-flashing-firmware-linux-ubuntu-t3486298) , are likely to be the instructions I'd follow with due care. If I persist and try to use [TWRP](https://twrp.me/about/) or some sort of program to "recover" my data it seems highly likely to wipe it (even if I don't proceed to root it). Along the same line, I suspect installing [LineageOS](https://www.lineageos.org/) would wipe the data in the process and there's probably no way to sift through the wreckage of the data (which is probably without pointers/inodes but presumably not outright erased) in some kind of brute-computational-force way either. Is there any way to get at the data (instead of waiting every hour to try to re-discover a strong and essentially gibberish password)?