Can I ask what is actually your intention? If you did train model by using transfer learning, then you probably have classifier already.
What I can imagine is that you want to use some other classifier, like one that classifies your* dataset, not dataset originally trained on.
If that's true, I can do it. I have done it already in couple of projects.
I did several similar jobs like a model that classifies is-a-bird/is-it-something-else, is-a-man/is-a-wman, fat-face/narrow-face and many more networks including RNN for extracting numbers from text, LSTM for toy-project of weather prediction, image compression by using auto-encoder, finding similar images (out of 100.000 dataset) by using FAISS and little bit more.
Best,
Vedran