It is/was my understanding that most used Jap imports don't have security systems ie alarms, immobilisers and chipped keys as standard (very little car crime in Japan?) - This is why the insurance companies insist on new cat 1 alarms being fitted. My Pajero was the same.
Are Security systems options in Japan? I own a AS200 is the RS200 ignition system different?
In my case the key was not chipped and, therefore, a standard Toyota unchipped blank was used and copied from my original on a laser cutter. Took about 2 mins to cut it!
The Locksmith I used was Morgan's, 575 Saffron Lane, Leicester LE2 6UN - Tel 0116 244 0338.
I would think any locksmith that cuts car keys should be able to do the job.
Hope this helps............