I am looking for anything in Dragon Magazine or 3rd party material that supports combining Pact Magic from Tome of Magic with Soulmelds from Magic of Incarnum.
Why yes, I did write up a highly acclaimed combination of these two. It was, unfortunately, hosted on a forum that has since died, but luckily the Wayback Machine has it, and so I present the midnight occultist, a prestige class combining Tome of Magic pact magic with Magic of Incarnum meldshaping. I have started a process of rehosting, reformatting, and revising the class in this Google Doc.
Aside from the midnight occultist, I am not aware of any other combination of these two. There definitely isn’t an official one, and a “true” third-party one would be nearly impossible as neither Tome of Magic nor Magic of Incarnum is available under any open license. Homebrew is the only realistic option, and as far as I’m aware, mine is the only one.