By spoon pipe I assume you mean a regular glass pipe? If this is what you are talking about I can't imagine it would be too hard to envision the outcome. There is a hole larger than a pencil led at the bottom of the bowl and you said yourself freebase DMT melts... if you haven't figured it out by now all I can say is no, not a good idea. Assuming you have crystals large enough to not get sucked straight down the hole, once you heat them they will melt and get sucked down the hole and into your throat. The only experience you will have is one of extreme pain as molten DMT burns the living hell out of your soft tissues.
Have you had success with freebase or any other form of DMT before? If so, would you mind elaborating on the experience? Maybe you could get (or give) a few pointers to help achieve success. There are many herbs you can use as a bed for your spice, you don't have to use anything special oregano will do fine, even tobacco if you smoke, mullein is also great as it will actually sooth your throat (much better alternative to burning it.)
'Little spider weaves a wispy web, stumblin' through the woods it catches to my head. She crawls behind my ear and whispers secrets. Dragonfly whiz by and sings now teach it.'