[JimmyR]

In /linkfonts/etc/conf.d/ I created a file named 99-tweaks.conf. In that file, I put:

<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
	<match target="pattern">
		<test name="family" compare="eq">
			<string>OpenDyslexic</string>
		</test>
		<edit name="family" mode="assign" binding="strong">
			<string>your font family</string>
		</edit>
	</match>
</fontconfig>

*You need a text editor that can save files with unix line endings.

Then:
KUAL > Fonts > Fonts Hacks Behaviour > Update fontconfig cache

It worked, mostly. For some reason, it changed the default sans font. The UI ended up using my serif font with which I overrode opendyslexic. Same thing after a restart. You might get a different result. *shrug*

Edit: I've used this method to override other fonts in the past on my old PW1 without ill effect. Not sure why I'm having a problem with this font.