Probably. If it works as a replacement DOOM1.WAD without any data from Doom Shareware included, you could run it using nxDoom either by renaming it to DOOM1.WAD, DOOM.WAD, DOOM2.WAD, UDOOM.WAD, TNT.WAD or PLUTONIA.WAD, and nxDoom will automatically detect that it's a shareware WAD, and load it appropriately. The catch is that it'll look strange in the modlist, but for an image that wouldn't be a problem.
If not... I could probably find out what data is missing to make it a full WAD, and add the appropriate stuff from FreeDoom.
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