Dear Bernard
I saw this article on the Canadian Voltigeurs that you might find of interest to read. A fascinating Unit. A British Officer said they had no love for the British but had even less love for the Invading Americans http://www.centotredicesimo.org/wp-content/uploads/2015/10/Quebec-Voltigeurs-M.I..pdf
Time line wise you could get Frederickson over there. You could definitely get him to Lundys Lane, Fort Erie and Cooks Mill if you wish.
Geraint
P.S If you've not read it, I can recommend A Triumph of Banners by John Fortescue on the War of 1812.
P.P.S Whats your thoughts on US General Jacob Brown, how good was he do you think ?
He was plainly pretty good as his successes in the War of 1812 attest, but beyond that I know nothing of the man, so can’t really answer you. Sorry!