I agree that P3D- owners are getting a bad deal. I picked mine up the day before the price drop. I didn't find out about it until Saturday, and then read that Elan would refund $5000, so I wasn't concerned.
The next day, I later called Tesla support and was told only PUP users were being refunded. She said that this issue was still being worked out, and she would file a ticket for me and told me to email support. I immediately sent an email and it's been two weeks with no response.
I understand why Tesla won't give us P3D- owners $5000. PUP upgrade costs to Tesla were a lot cheaper than $5000, maybe in the range of $1,500 - $2000. So it was not a bit hit for them as it would be to give the same deal to P3D- owners.
Personally, I like your options 3 and 4 (if you already had paid for EAP), and how about option 5) Give me free EAP. That would be the cheapest cost to Tesla, but yeah, what about people that paid for FSD. So EAP, 'd be happy
FUSC does not offer much value to me. I don't plan on taking long trips, and use my Model 3 mostly for local commuting.