Originally Posted by
icepick_trotsky
Option 1: Replace the RD with a longer cage model. Boring.
Option 2: Get creative with chain length.
This is not intended to be harsh, just helpful.
Option 1 is not boring, it's almost mandatory when building up a bike for someone else. If you're riding it, at least you will be aware of the details of the final build and whatever limitations it will have.
Option 2 It won't be creative, it will be risky. Sure it may work on the stand in the shop but the real world has other plans.