I just took in Bazza's post of 4 days back: " ... there is an anglo called the Shanteyman model made by Colin Dipper,its in the keys of F/C,I expect you could have one made by one of the accordion reeded makers in this which would not cost as much and have a much shorter delivery time ..."
Charley Noble - who sings shanties over there in chilly Maine - has a C/F Stagi ... which I understand to have been made to order. I guess he might be able to give you a better idea of the cost and time factor (Charley ... Are you out there ... ? - or you could PM him, now he and Judy are back from the Antipodes!)