With that keypad, an E62 is the perfect machine for minicom. Too bad I haven't heard about that kind of app being available for S60.
I think that there are some debugging tools that operate over BT serial port. Maybe ask on the forum Nokia developers site.
If you have the time and skill, you can make your own app by looking at how the open source Bemused app works. They use BT serial port and RFCOMM to control PC apps from S60 phones.
http://bemused.sourceforge.net/
Let us know if you find something. Thanks.