Taking a look at Canada, I reached the following totals:
Antiochians: 1 Cathedral, 15 Parishes, 1 Mission
Greeks: 1 Cathedral, 2 Monastic Communities, 52 Parishes, 15 Missions
Serbians: 1 Cathedral, 1 Monastic Community, 21 Parishes, 4 Missions
Romanians: 2 Cathedrals, 1 Monastic Community, 15 Parishes, 2 Missions
ACROD: 2 Parishes, 2 Missions
Bulgarians: 1 Cathedral, 2 Parishes
OCA: 2 Cathedrals, 8 Monastic Communities, 31 Parishes, 25 Missions
Ukrainians: 6 Cathedrals, 64 Parishes, 6 Missions
Total Numbers: 14 Cathedrals, 12 Monastic Communities, 197 Parishes, 55 Missions
British Columbia Totals: 1 Cathedral, 17 Parishes, 20 Missions, 1 Monastery, 1 Hermitage
Alberta Totals: 1 Cathedral, 27 Parishes, 7 Missions, 1 Hermitage
Saskatchewan Totals: 2 Cathedrals, 22 Parishes, 1 Mission
Manitoba Totals: 1 Cathedral, 16 Parishes, 1 Mission, 1 Seminary
Ontario Totals: 6 Cathedrals, 93 Parishes, 20 Missions, 4 Monastic Communities
Quebec Totals: 3 Cathedrals, 23 Parishes, 4 Monastic Communities, 10 Missions
The Maritimes and Newfoundland Totals: 4 Parishes, 4 Missions, 1 Monastic Communities
From the beginning I should note that this proposal would be possible either by being autocephalous, autonomous from Constantinople, or autonomous from New York. Also, I used the Slavic usage of styling hierarchs, (i.e. Metropolitan, Archbishop, Bishop, Vicar Bishop) not the Greek. In many cases, I borrowed from my own jurisdiction, as it is of those in Canada, the only jurisdiction self-contained in Canada answering direct to Constantinople.
Canadian demographics do not allow for an even distribution of parishes among the dioceses. Each diocese corresponds easily into geographical boundaries except in Ontario, with the Diocese of York and the Diocese of Ontario. The Diocese of York, being the Greater Toronto area has 2 Cathedrals, 37 Parishes, 8 Missions and 2 Monastic Communities. As a result, the Diocese is the largest in the country with 4 Cathedrals, 56 Parishes, 12 Missions, and 2 Monastic Communities.
Metropolitan of Canada, Archbishop of Winnipeg and the Central Diocese
Archbishop of Edmonton and the Diocese of Alberta
Archbishop of Vancouver and the Diocese of British Columbia and the North
Archbishop of Ottawa and the Diocese of Ontario
Archbishop of Montreal and the Diocese of the East
Archbishop of Toronto and the Diocese of York
Bishop of Saskatoon, Vicar Bishop of the Central Diocese
Bishop of Calgary (Future), Vicar Bishop of the Diocese of Alberta
Bishop of Kamloops (Future), Vicar Bishop of British Columbia and the North
Bishop of Hamilton, Vicar Bishop of the Diocese of Ontario
Bishop of Mississauga (Future), Vicar Bishop of the Diocese of York
Bishop of Halifax (Future), Vicar Bishop of the East
Bishop of Windsor, Publications and Communications
Bishop of Toronto, President of Toronto Orthodox Theological Academy
Bishop of Regina, Domestic and Overseas Missions
So the Synod would at some point, have 15 hierarchs. Those marked “Future,” are locations which do not currently have a Cathedral. I realize the number is high, but I wanted to give all Cathedrals a Bishop, and really if all the jurisdictions work together, it would be justified. Additionally, Canada is more spread out and this allows for the workload to distributed more evenly.
In terms of monastic communities, although every diocese has at least one, the Diocese of the Midwest and the Diocese of Alberta both do not have a full monastery but rather hermitages, sketes or the like. Give that the desire is to have hierarchs come from the diocese itself, this needs to change.
In terms of the Prairie provinces, the Church should also begin a large sacel permanent deacon program, in order to rejuvenate the tiny country churches. This program would be the keystone of the Church’s mission work in Canada.