Finishing Sign of Safe Passage as a mage?

So I'm a level 15 mage that's been able to do every quest pretty well up until this stupid rogue quest that requires me to equip a bow, which wouldn't be a problem if the game didn't scale shop items to my level and so the only bows I can buy are tier 5-6 and require like 26 dex to use. Anyone got any ideas on how I can get around this or find a bow that my mage can use? (He has 14 dex)

I've tried selecting Leliana and using the firing point but it just goes over to my mage and gives me the option to come back prepared or leave it alone. Really wish they WOULD let me use my rogue to do it lol.