It would be nice to be able to combine models in the same way we are able to quantize them with stable-diffusion.cpp. This would not only potentially permit folding text encoders, LoRas, etc into a single model file, but also better support certain models that come in split files. Instead of being a separate mode, I would think that it should be an extra option for convert, in the form of --combine-model, which could be specified multiple times.