I just reread this post after some time and it occurred to me that I think there is at least one example of a unit of converged grenadiers being formed from different nationalities. During the first siege of Limerick, the Duke of Wurtemberg describes the formation of a force to 'open the approaches'...

Newly joined member here, just getting into the period. I am building up a Danish force, designed to be fairly generic for use in the 9YW and the early years of the GNW and WSS. I realise there were differences over this period, but I am willing to live with them. Whilst I have gained a good idea of...