I don't really understand the process of making a mod. But, I think you should be able to replace shotgun model with dildo bat, right?
And for the bullets, can you make that 'gooey' stuff using particle in Maya and export it as a fixed mesh? lol... Maybe the dripping part is a lil' bit too much for now.
Anyway, don't forget to share the video if you managed to get this done
Omg, Yes!