The flavors you lose are the unfermentable sugars. I would expect that the beer might be thin or more bitter than you intended because in part those balance the hops. Taste before you bottle and if its still markedly bad then you can always blend it with a batch with too much crystal and bottle or keg.
ETA: Never mind I see that it is bottled. What you have is beer, not the beer you intended. Some of that hop character may mellow a bit. If it ends up that you simply cannot drink it then a dunk in Starsan and pouring into a bottling bucket to mix with that other batch I mentioned is a possibility. Also remember that Porter came to be as a blended concoction. You can mix it half/half when you serve it as well. Or if you have a friend who is a hop head mention you have a "great India Export Porter" and let him chug through it while you drink the better stuff.
Cooking with it is another possibility - I use beer and DME to parboil brats and onions before grilling - then caramelize off the onions as a topping. No sense in using your best beer for that.
As mistakes go this is not the worst one you could have done! If it's otherwise clean and well done it's probably better than a lot of the beers I've had to judge.