Creating an integrated key 

It should work if the sizes are right

@@nuckymcnuck Thank you! Both videos of yours were great help! Keep up the good work!

Not really - I tried a number of them, and the one with the red and green buttons for Daihatsu are the only ones that I know work.

Nick G Okay, thanks, do you know any other place to purchase this case? Cant buy it on aliexpress

Depends on what remote entry fob the Sirion has. If it's the same as the Copen, it's very likely to work.

Nick G Cool. Did the key remain tight, or did it get easier?

The key blade is still a bit tight - I might bring it back to the locksmith to file it down. The fob inside the new housing has remained tight. The only issue I had was that the transponder clip came a bit loose, but that was fixed by gluing the chip into the little holder in the key

Nick G Interesting, well, I haven't got my SIrion yet, but a fair few of them have missing remotes because people lose them. This is a good way to avoid that (not that I've ever lost one in the past)