I know. Nobody online seems to understand the question.Found one guide that said it would show how to do that and then proceeded to show how to change defaults... not helpful
problem is that Outlook uses the default browser on system now, I can't see a way to do what you want.
I understand the question, but like Colif, I do not think you can do what you want to do in "full automatic" mode. The whole default programs concept, which has been around a long time now, is to make certain file types (or web links, in the case of browsers) open in one's chosen favorite.
The only option I see is using the context menu to copy your link, manually opening your second-tier browser (or keeping an instance of it open and minimized), then pasting the link in to that browser.