I see there's an option for launchpad for the hot corners, but I don't see it under shortcuts under Mission Control. Is there no way of using the launchpad with a mouse shortcut?
I'd have to double-check but I'm pretty sure my MX Master 2S has that feature. It should be supported by all Logitech mice with additional individually configurable buttons. It's simply a setting in their Logitech Options software suite.