You don't need to re-sign the apk, you can just replace the icon in /res/drawable-hdpi/ with the normal one, then re-flash the zip. This worked fine for me.
Regarding the icons, I tried replacing the icons in the GAPPS .apk files, then re-signing them and putting them back in the .zip to flash onto the phone. It didn't work, the apps didn't install
I'll keep trying
I've attached a version of HTC IME for this rom. It's just pauls original mod re-jigged to work for 2.2. I've not tested it extensively but it seems okay so far.
HTC_IME_hi_blade.zip 4.27MB 171 downloads