i think that the gapps you found will work on nexus 4. as far as i know gapps are the same in every phone. also you can install Root Uninstaller or anroid tuner or rom toolbox or any similar application to uninstall what you don't want manually. that is what i did
Yes, but i keep the rom and gapps i use saved on my phone so i dont have to re download them whenever i need to reflash them, and i prefer the smaller gapps so i dont have a 200MB file on my phone, when i could have a much smaller 20MB file on my phone. And ive never heard of being able to flash an N5 gapps to a N4. I hard bricked my last N4 flashing things made for a different phone.