Re: Or the fourth option...
I have been running my phone without google apps and services installed since January. It started as an experiment, but I've not ever felt the need to go back.
When I deGoogled a previous phone,1 the only thing I had trouble with was finding a calendar app that would work without access to the Google calendar service. I didn't want one that sync'd with anything, just something that would show a valid calendar and let me note things in it. None of the ones I downloaded off F-Droid, including supposedly "offline" ones, worked with the Google calendar service disabled.
So I just created notes for appointments, and transcribed them into my work calendar whenever I got around to it. Worked OK. Back in the Dark Ages we used to do the same thing with pen & paper.
1Which I'd still be using, if the screen hadn't spontaneously failed completely. Replacement phone didn't last long enough for me to get around to deGoogling it; the touchscreen stopped responding to touches less than a year after I bought it. Haven't even gotten around to rooting the current phone, and I'm not sure I want to take the time, because these things are crap that breaks far too quickly. (My Nokia Symbian 6 phone worked fine for 3 years, and still works when I need it as an emergency backup, though the battery life is rubbish and there are few dead pixels on the screen. None of the Android phones I've had have made it past the 2-year mark.)