How to get KDE to update settings once config file has been changed

I am updating a kde config file (~/.config/kaccessrc) using a script.

My script makes the required change to the file but the settings are not updated on the system. I assume I have to tell KDE to re-read the config file but I don’t know how.

After a bit of research I’ve tried using kwriteconfig5 to modify the file, which it does, but the system still retains its old behaviour. I was hoping kwriteconfig5 would have triggered KDE to use the new configuration. kwriteconfig5 doesn’t appear to have a man page and it’s default help page doesn’t mention anything about this:

Usage: kwriteconfig5 [options] value

Options:
  -h, --help       Displays this help.
  --file <file>    Use <file> instead of global config
  --group <group>  Group to look in. Use repeatedly for nested groups.
  --key <key>      Key to look for
  --type <type>    Type of variable. Use "bool" for a boolean, otherwise it is
                   treated as a string

Arguments:
  value            The value to write. Mandatory, on a shell use '' for empty

The required change does take place if I log out and back in again, but I need the change to happen as soon as I run the command.

I’ve tried searching online but can’t find a directly relevant scenario.

What am I missing?

Update: Background of what I’m trying to achieve

I would like to have a script that toggles ‘keyboard navigation’ a.k.a. ‘MouseKeys’. Once I have the script, I want to bind it a key on my keyboard so I can turn it on and off at will. At the moment, I do it through the system settings dialog a number of times a day.

The reason I use it so often is that some websites I use have very position-dependent on mouseover() events. For example, on Meteociel, which displays weather forecast model runs, you change the time you are looking at by moving your mouse over the timestamps.

I find using the keypad to move the mouse very helpful on these websites as it means I can keep my eye on the chart and know the mouse will be moving vertically, but annoying the rest of the time.

I would like a keyboard binding to do this to make my workflow more seamless. At the moment, the delay I get by restarting plasma shell upsets my workflow more than using the settings dialog.

sudo apt install xkbset
xkbset mousekeys   # enable mousekeys
xkbset -mousekeys  # disable mousekeys