I'd say hike up the practice time and woodshed them both. The last movement of Beethoven 9 is enough to make even the best bass players sweat and certainly can not be learned well enough in that time frame. Beethoven 3 doesn't nearly as many complicated licks as 9 and will take a fraction of the time it will take to learn Beethoven 9. For the Sibelius, if you can do ricochet you'll do fine and its just a lot of counting, and the Glinka isn't terribly hard, just practice a lot of scales and that will go over well.
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