In that case, I would suggest either storing PP in cognizance crystals (expensive), or just going with the Cloistered Cleric route. Travel + Undeath domains gives you 4 minutes Travel Devotion per day even with a Charisma of 8 (1 base use, 2 turn attempts/extra use, 2 turns + 4 from Extra Turning via Undeath domain). Nab a 12 Charisma or another method of +2 turn attempts if you want the leeway for an extra encounter or two per day. You also get Knowledge Devotion from this if you want it, and a couple of 1st level spells.
Getting enough PP to fuel dimension slide it tough if you only want to spend one level on it. At 1 PP/round, that means an average of 16-20 PP/day. Ardent 1 + Practiced Manifester + Wis 18 gives only 12 PP, a little short. You can make up for it with another level of Ardent (18 PP), a 1 level dip into Psychic Warrior (taking Practiced Manifester as your bonus feat; 22 PP), a 1 level dip into War Mind (16 PP), a Wisdom of 22 (17 PP), or a proper Manifesting weapon (your bow or sword or whatever; 17 PP). Each of these options has advantages and disadvantages compared to the others. Any way you do it, you're expending more resources for the same or less benefit that Cleric would give.