Hi Andrew,
My friend Dave (vintagegale.com) has been refurbishing Gales from all over the world for the last 25 years and his expertise is unique, so I asked him. His reply:
„Morning Lothar;
You are quite right, how could there be any difference? Using them upright is quite a common thing to do!“
Based on testing and having answered that question many times.
If somebody does not agree, there is an easy solution: Just do what you like ! ;))
Lothar