replacing key with flip key

[Jam Jar]

Hi, just seen e bay ad for a conversion kit for turning a normal key in a proper flip key(audi Mercedes etc) seems cheap at 14 notes, seems quite easy to change over, wonder what other people think. Jam Jar....

 

[Jen319]

Like this kit?

http://www.ebay.co.uk/itm/NISSAN-MI...cessories_Safety_Security&hash=item19d4c2ebd1
I'm not sure if anyone has ever done this.
I guess as long as the NATs is still in the fob? Should be okay to seperate the actual key to fit it to the...turning part...thing ^_^