How to remove lost SmartKey from programming

I just lost one of my SmartKeys on my '06 Prius. Trying to find an economically solution to my problem and how gone through many of the threads on this forum. Seem like the options are:

1. Get a brand new keyfob. And follow instructions on this thread to add it:

http://priuschat.com/forums/knowled...lly-how-program-non-sks-key-fob-detailed.html

Seems like there are a couple reference of success stories in that thread. Can anyone confirm?

2. Get a used smart keyfob. Have to be programmed at dealer/locksmith with the more expensive "seed reset" procedure to gain smart/entry function.

3. Get any smart/dumb keyfob and use in slot to start car + metal key for entry with programming instruction above.

I am leaning towards option 3.

I have the following questions which I can't seem to find answers for:

1. How do I ensure the old key is removed from programming? In case someone "found" my old key I don't want it to be able to start my car or worse trigger my siren remotely and locate my car to gain access. Does it require a "seed reset" at dealer?

2. If I add a key for slot start only and later lost my other smartkey, would it be able to add a smart key back with just the non-Smartkey? I saw some mention of ppl losing both smartkeys and the extensive trouble to get car reprogrammed. I want to make sure I am protected from that with just the non-Smartkey option.


Thanks!