I don't think it's worth it, but the most plausible thing would be to use the CI low driver from the SM3 and add it to the TF10. However, it's much cheaper if you just ordered the CI driver online, instead of destroying a perfectly good earphone for no reason. It's not practical to add the mids and highs of the SM3 to the mix, as they are delivered by a single dual receiver, the TWFK, and it doesn't quite fit in with the rest of the crowd. However, I've had a TWFK + 33A before, so that's plausible as well. The 2389 (UE-High) of the TF10 can also be added to the CI low of the SM3 for a dual driver configuration, but somehow I don't think you're interested in making two earphones by mixing and matching one another. Also, most companies won't be willing to do this for you, as they don't want to take the time investigating how to best implement the crossover. They usually have set formulas, like the TF10x4, TF10x6, SM3x8, etc. I advise you not to try this.