I’m kinda sure the KBR1 reads the Spark 2 aswell.
TagWriter by NXP on your phone. Also get TagInfo.
Flexes are flatter than xSeries
No, you’d use a normal NFC writer. With a flexM1 gen2 you could even use your phone. Read more here. The cloner is just for the T5577.
Can you change your locks at home?