There is a theme that will accomplish changing 1XEV to 3G though and works on the 9630. BlackberryOS - Your Blackberry RIM Software and RIM Applications Source - 3G For All Theme Changes 1XEV logo to 3G on all Tours!
Check it out, there are a few different flavours of it and it works great, even has a weather slot in the top right hand corner.
The only down side to it is that it could get kind of confusing, if you ever go into an area that only offers 1X service. But the post mentions all that.
Ops, hopefully you don't mind sharing info from a "rival" site. If you do, feel free to remove it, I won't be offended