First things first - Libre does NOT replace finger pricking, I (and others) find it is not sufficiently accurate to dose from. And this is the advice from most diabetes teams in the UK. It is a fantastic tool for spotting trends and making adjustments to insulin timings, etc.
Secondly, I fly several times per month and have never found it any more difficult to test on a plane than anywhere else.
Thirdly, if your fingers are getting sore, have you tried changing where you lance (the side of the finger is the usual recommendation) and the depth of the lancer?
Currently, if you drive, there is no way to get away from finger pricking - the DVLA do not accept any other BG readings and you should test at least every 2 hours when driving,
Finally, to your question - what do you want on your daughter and wive's phones? Access to your previous scans or the ability to scan each sensor on multiple phones? I don't know for certainty but I suspect the latter is not possible. I know if you start your scanner off on the phone, you cannot read it on the Libre Reader.
However, perhaps you could invest in a battery pack for your phone so you can charge it when you are out and about. These are relatively inexpensive, small and can store enough power to charge your phone multiple times. I am sure your wife and daughter will see the benefit of keeping their own phones for themselves
Regarding getting Libre on the NHS, you need to talk to your local team. As of 1st April, the criteria should be unified throughout England but at the moment there are local variations.
From my understanding, the BG you go to bed on depends on what happens to your BG overnight. Personally, I would not go to bed with a BG as high as 10mmol/l. However, if you find your BG falls and you wake at around 5mmol/l (but find your BG remains reasonably stable during the days), this is different to going to bed on a 6mmol/l and waking at 3mmol/l.
Wearing a Libre will show you what happens overnight and help you (and your diabetes team) decide what your basal insulin dose should be and what BG you should have for bedtime.
Sorry if I was a bit harsh at the start but many people do not seem to understand how to use and get the most out of a Libre ... and waste their (or the NHS) money.