Sorry to start with a necro-post, but I saw Lukasz Gaszewski's picture and wanted to suggest my preference would be to add an additional maple leaf to all the field grade officers. It does not fit the UK patter, but it matches the other European nations that use pips with crowns (Sweden and Monaco) and it would put maple leaves in every officer rank. I think it would be pretty cool.
Looks like Canada is already sending the general officer ranks back to this patter.