How can I make keyboard shortcuts register on key release, rather than on key press?

You can achieve it this way:**

Install xbindkeys
```
sudo apt install xbindkeys
```
Run the command:
```
xbindkeys --key
```
In the white box that appears, Press your key combination. Example Win + E will return the following :
```
"(Scheme function)"
    m:0x50 + c:26
    Mod2+Mod4 + e
```
Now copy the last (or last second) line and use it as given below.

In newer versions before you need to do this, which let you jump the next step:

Please, create one with 'xbindkeys --defaults > /home/$USER/.xbindkeysrc'.
or, if you want scheme configuration style,
with 'xbindkeys --defaults-guile > /home/$USER/.xbindkeysrc.scm'
Create a new file .xbindkeysrc in your home Directory
```
touch $HOME/.xbindkeysrc
```
Open it
```
nano $HOME/.xbindkeysrc
```
Enter your required command and keys as given below
```
"nautilus"
    release+Mod2+Mod4 + e
```
(Note: Don't forget release , Replace "nautilus" with any command.)

Similarly add all the requires command-key combinations one below the other
Now add xbindkeys to xinitrc:
```
sudo nano /etc/X11/xinit/xinitrc
```
add xbindkeys to the starting (1st line or before . /etc/X11/Xsession)

Reboot your system and you should get expected behavior

TIP: Make sure you don't set conflicting configurations in xbindkeys and your GUI method provided by your DE

For more examples, man xbindkeys.

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