Llandegla is on here - scroll down to bottom of page:-
http://www.gps-routes.co.uk/routes/...alks/llandegla-forest-walking-and-cycle-route
You did ask for a gpx route? (though why you need one for a way-marked trail centre trail I'm not sure). Up to you...
Penmachno - I downloaded this one earlier this year but never used it so can't comment on the accuracy.
Navigation there is easy enough but there is a diversion
https://www.facebook.com/penmachnomtbtrails for details
GPX viewer