I found some additional information that should help.
First, there is a T7800 which is almost as fast as the T9500:
http://www.cpu-world.com/Compare/57...Intel_Core_2_Duo_Mobile_T9500_(Socket_P).html
And the good part is that I have found evidence of the T7800 working in the A200:
https://browser.geekbench.com/geekbench3/264902
Also, the T7700 came stock on one version of the A200. And the T7800 is just a higher clocked version of the T7700 so it has a very high chance of working without any issue or even a bios upgrade:
http://www.cpu-world.com/Compare/57...Intel_Core_2_Duo_Mobile_T7800_(Socket_P).html
The T7800 is just like a much higher clocked version of your current T7100, so really good chance for it to be a quick swap and up and running:
http://www.cpu-world.com/Compare/57...Intel_Core_2_Duo_Mobile_T7800_(Socket_P).html
And still a significant boost in performance:
https://www.cpubenchmark.net/compar...7800-vs-Intel-Core2-Duo-T7100/1010vs1005vs999
And there's a chance the T9500 will work too as I just found evidence of a T9300 working in an A200:
https://browser.geekbench.com/geekbench2/204917
And since the T9500 and T9300 are basically the same except the clock speed, there's a chance the T9500 would work:
And the T9300 is also a solid boost, basically in between the performance of the T7800 and T9500:
https://www.cpubenchmark.net/compar...800-vs-Intel-Core2-Duo-T9300/1010vs1005vs1008
At this point, if you want to be completely certain it would work, I would go with the T7800, but if you want to gamble a bit, I'd go for either the T9300 or T9500.
Hope this helps!