I would most likely suggest that you then create a mage/rogue hybrid prestige class that gained these spell like abilities every other level instead of the requisite caster level increase for that level.
Hmm.
Let me see:
Requirements: Dodge, Spot 6 ranks, Search 6 ranks, Ability to cast non-spontaneous arcane spells, Uncanny Dodge.
Level 1 special: Improved Uncanny Dodge (if the character already has improved uncanny dodge they get Sixth Sense instead.*)
Level 3 special: Evasion, analyze Dweomer 3x per day
Level 5 special: Improved Evasion, Analyze Dweomer at will
Level 7 special: True seeing 3x per day, Greater Arcane Sight 3x per day
Level 9 special: True seeing at will
Level 10 special: Sixth Sense (If the character gained Sixth Sense earlier, they instead get Foresight Contineous at will), Greater Arcane Sight at will
Hmm.
Let me see:
Requirements: Dodge, Spot 6 ranks, Search 6 ranks, Ability to cast non-spontaneous arcane spells, Uncanny Dodge.
Level 1 special: Improved Uncanny Dodge (if the character already has improved uncanny dodge they get Sixth Sense instead.*)
Level 3 special: Evasion, analyze Dweomer 3x per day
Level 5 special: Improved Evasion, Analyze Dweomer at will
Level 7 special: True seeing 3x per day, Greater Arcane Sight 3x per day
Level 9 special: True seeing at will
Level 10 special: Sixth Sense (If the character gained Sixth Sense earlier, they instead get Foresight Contineous at will), Greater Arcane Sight at will