Did you check out the similar ones here in the project section, if not, you might get a couple of ideas
This one
This one
You can definitely do it that way, for mine, I decided against it and just removed the lock barel, worked perfectly, and the Push to Start Button slotted in perfectly into the sterring collum shroud.
If you require a key chip, this can be removed from a key and placed next to the antenna coil.
Have a read through those links, I’m happy to answer any questions I can.
I hope to carry on with mine in March, so keep an eye on my project, that I will update as and when; Unless you get yours done first and I may just copy yours. 