It's possible.
You could use the MESSAGE command in agkhelper.java, inject some vibrate code in there...something like:
Vibrator v = (Vibrator) this.context.getSystemService(Context.VIBRATOR_SERVICE);
// Vibrate for number of milliseconds set in your Tier1 message command
v.vibrate(Integer.parseInt(msg));
You'll need to import android.os.Vibrator and include <uses-permission android:name="android.permission.VIBRATE"/> in the manifest.
Then just compile up your own version of the player and use the message command to vibrate in your Tier1 code like this:
// vibrate for 1000 milliseconds
message("1000")
p.s. this is not tested... code given for example of a possible solution only.