Hi Aurelien and thank you for your contribution.
I agree, this is also a good solution (and an easy one !), I edited my first message in consequence. However, the meticulous part of me don’t really like to use this method as you cannot easily edit the model files names (afm, aird and melodymodeller). Actually I don’t know if this is even possible.
However, I agree that keeping the diagrams is a good point in favor of this practice. It is not hard to do it also with libraries and REC/RPL by copy/pasting the style and layout but it needs a bit more effort (and time), even more if there are a lot of diagrams that you want to keep.