...analog lines but to the UCx, they are SIP..."
Analog trunks provided by an internal card are DAHDI devices - they have nothing to do with SIP.
To reach external phone numbers in Follow Me settings, UCx uses the numbers to determine which outbound route to take. The selected route can certainly use analog trunks provided by an internal FXO card. The Follow Me dialing works exactly the same way as if you dialed the same phone number from the phone for which you configured the Follow Me.
As telcodog pointed out, make sure to add # after any number that is not an internal extension (that is after any external number, ring group, miscellaneous destination etc.).