Haha! That’s my middle name! 
I am quite cautious anyway, so I still think it’s a good idea, especially as I’m already thinking about adding a second Launchpad at some point in the future. Additionally, the hub will get plenty of use anyway, it can sit on my desk and power my tablet, for example.
Cautious Helen was keeping an eye on the Shield with the Launchpad plugged in during last night’s experiments and I was happy that the Shield’s case didn’t feel hot - I’ve noticed it tends to run a little warm anyway, but not alarmingly so, and it didn’t feel any warmer than usual while powering the Launchpad.
The hub should be delivered today so I’ll hook it all up then and see how it goes, and report back later!
Edited to add:
I’ve been keeping notes on the various aspects of getting the Launchpad Mini Mk3 and Monome Norns Shield to work together and have reached the point where I’ve gathered enough information to compile a ‘how to’, which I’ve attached with this edit.
Lovely lines community people, may I present to you my humble ‘pay it forward’ gesture in the form of a 4-page PDF, Getting a Novation Launchpad Mini Mk3 working with a Monome Norns Shield - A rough guide for n00bs, not-very-technical people and the otherwise faint of heart…
Comments and suggested amendments are welcome.
Love, light and chocolate muffins to you all
Helen 
Norns Shield and Launchpad Mini Mk3.pdf (490.8 KB)