Amusing as always but your comments seem to imply setting the target charge to 75% requires additional (perhaps herculean) effort. It's doesn't. In fact, it's exactly the same as setting it to 100 with the added benefit that you may have more range someday. Hardly some anal-retentive exercise. When I need 100%, I'll take ten seconds to change it.To echo @Packard V8, there is no evidence any Chevy Bolt has suffered due the owner's choices with regard to charging it. There are Bolts with over 100,000 miles that have seen lots of DCFC charging and many deep discharges and have modest battery degradation.
If you didn't worry about looking after the catalytic converter in your fossil-fuel car, probably best not to worry about your Bolt's battery.
But sure, if you want to keep your Bolt for 30 years and drive it 500,000 miles, feel free to adopt whatever battery babying strategy makes you happy. And to that end, I have a suggestion for prolonging your battery life:
Take the car, discharge the battery to 40%, and place your Bolt in a refrigerated storage facility. Disconnect the 12 volt battery. Do not drive it. Every couple of years, perform the usual maintenance you would on a stored vehicle and drive it a little, perhaps 100 miles or so, returning the battery charge to 40% when done.
Follow this regimen, and in 30 years, your car will be ready with maximal range to tackle some real road trips! (Assuming it is compatible with the 500 kW CSS-5 charging stations on the route, of course, and that human-driven vehicles are still allowed on the interstate.)