Here in France, I'm pretty certain that it's not going to happen. Traditional timber framing here is short-span with lots of studs, and it's very common for wall plates to be scarved given that they are exceptionally well supported. I do understand about avoiding scarves where possible, but (as long as my maths is right) they are so heavily over-engineered, that the loss of bending strength simply isn't an issue.

In reality, I don't have the option to work with full-length beams even if I could get them. The site is such that moving them would be a nightmare, and crane access isn't an option so getting them up to roof height would be exciting.