Well . . . if you're
sure you want that, then yes. But neither of those is really necessary for a rogue, and I can't imagine spending the materials or gear slots for them. Also, keep in mind that you can fairly easily get +3 exceptional skills on Dragontouched armor (and it goes in the Eldritch spot, so minimal grinding, since you can buy Eldritch runes with Draconic runes).
One possibility is to completely disregard the exceptional int skills (since you can get every trap in the game without them). Then put +3 exceptional Cha skills on your Dragontouched and craft a set of GS goggles like
these: +1 cha skills, + 2 cha skills, Haste clicky, Air guard (hastes you or knocks down enemy), and +2 exceptional reflex save (actually really nice for a rogue). (They also have Wizardry VI and +50 SP, but you can disregard those.) They're pretty expensive in terms of materials, but they'd let you get your +6 total exceptional UMD while being genuinely useful in their own right.
Along the same lines, a single-shard alternative to get the +1 and +2 cha skills would be
these goggles: +1 cha skills, + 2 cha skills, Raise Dead clicky, and Deathblock. Definitely not as useful as Air Guard and exceptional reflex save, but only takes 12 large ingredients instead of 24.