Marisol can do these things! I don't think she'd be fluent in Tevene, but I feel like it'd be plausible that she has some grasp of reading it due to her interest in Tevinter, but native/mage/Gets Stuff about Tevinter, she'd be super into this. Also she can be stealthy and investigatey.

In terms of stuff I'd be into RPing, the heist itself could be really fun, like just a couple scenes a la Oceans 11 of different stages of the heist that are potentially a bit ridiculous.