A: Yes. Since you are side-loading the APK, you do not need Google Play Services. It will work perfectly on HarmonyOS.
Stock launchers (like One UI Home, Pixel Launcher, or MIUI) rarely support third-party icon packs. You need a custom launcher. The best free options include: Download MinmaRed Icon Pack - APK - v1.0
: If an icon doesn't change automatically, long-press the app on your home screen, select Edit , then choose the desired icon from the MinmaRed library. A: Yes
: Purchase and install the MinmaRed Icon Pack from the Play Store. Download MinmaRed Icon Pack - APK - v1.0
Yes.