Stop Ctrl+v doing page down in mail and safari apps (Mojave)

I have same problem as Using CTRL +V in Mail app on Mac Os X but in Mojave and for more apps.

I have Ctrl+v setup as paste in System Preferences -> Keyboard -> Shortcuts. This works fine in many apps but in the mail and safari apps it does a page down. If I hit Ctrl+v at the bottom of the text window then it works as a paste, meaning I can paste stuff into a text box but only at the bottom. How can I stop it doing this page down?

The solutions in the other questions involved mapping the command key to the Ctrl key using a feature that I can't see in Mojave. In any case this is not acceptable as I want to be able to use the command key in other situations.

Solution 1:

Create or edit the file: ~/Library/KeyBindings/DefaultKeyBinding.Dict (may need to create the folders as well) to contain the text:

{"^v" = noop:;}

You will then need to close and re-open the programs that you were have problems with.