3. Since they wont suspend my license until I start identifying myself, would it hurt me asking for extended payment I if identified them at the end of the 20 day notice?
What is this "the 20 day notice" of which you speak?
You have apparently received 7 NIPs, all dated between 40 days and 58 days after the respective dates of offence, issued in 2 batches 8 days apart.
At first blush, if the RK receives a NIP ~6 weeks after the date of offence, the most likely explanation is that an earlier NIP was issued in time to be served within the 14 days, but apparently was never delivered, and the sausage machine generated a "reminder" when no response was received.
Or that the "RK" is not the RK - although apparently in this case, you are.
For 7 NIPs (or more) to be lost in the post, but 7 "reminders" to be delivered promptly is implausible.
For "reminders" to be issued in 2 batches, as opposed to a set period after each individual s. 172 response was due, there was IMHO likely to be a conscious intervention/override.