How long's it been in bottles? I'd give it a month or two more to see if the pepper mellows.
You could blend as you suggested, but I'd only do it as a last resort, as the transfer is probably going to introduce a lot of oxygen.
EDIT: Doh! I supose you could re-boil the bottled beer with the new batch, and avoid the oxidation issue. But I'd still give it more time, and only do that as a last resort. If it's a test batch, you'll want to see how the flavor evolves over time, anyway.