I don't mean to step on any toes since I obviously did not come up with this I simply modified the line numbers in the patch because they changed in 3.0.4 and now posting it for my brethren to use. All credits go to post #3 on this thread...
This is only meant to change JUST TYPE, nothing else. I modified the original script in post #3 and successfully tested on my HP Touchpad 32.
FYI: you can easily just mail this to yourself and SAVE it to your device, don't just open from e-mail. Then use Internalz Pro file browser to navigate to /media/internal/downloads to open the file. I did not use WebOSQuickInstall but you could if you wish. Or you can transfer to device then open in Internalz Pro as well.
On 3.0.4 -- I have not been able to find the solution for making Advanced Browser as the default browser for apps like e-mail and twitter, etc. Waiting for that patch/procedures like everyone else