Your party is fine, there's no need to switch anything unless you desire some cheesy imbalance.
Switching your mage to priest and your priest to mage will delay your access to the high level spells by about 1,000,000 XP, your spells will be easier to resist and your saves will be worse because you're lacking 320,000 XP or about one level in the final class. There's enough time (but no need either) for switching classes in W7.
If you insist on switching level 10 is very late, giving up extra 160k XP in your final class just for one level up from 9 to 10 just for a few skillpoints.
If you want more alchemy you could have your fairy switch to ranger at level 7-8 and switch back to ninja at the same level (requires reloads at level up).
The bardic instrument will be useful all the time until the end.
Ranger is neither good in W6 nor in W7.
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