1. Jupiter - Spur , Jester - Spur , Feista - Spur. Boleo - Spur - Ashmeads - Spur , Pixie - Spur.
If they're big enough summer prune, if you want more growth winter prune.
2. I have a box of mixed apples stored in an unheated utility room this year as a test and they're all fine.
3. Those litter picking tools are handy if long enough, otherwise they sell fruit picking bags on poles. Stay off the ladders - it will only get worse as you get older
You can always reduce the tree height.
4. I've experimented with lots of high density pruning techniques .... unsuccessfully.
5. Off the AK's the Pixie or the M27 stock itself ?