The only way to get the battery through the winter is to charge it regularly (lead-acid batteries should be stored fully charged in a cool dry place). I'd take it off the bike and use an Optimate as you suggest. It doesn't need to stay on it permanently, maybe one day every couple of weeks will do nicely.
I'd fill the tank with fuel just before you put it away. It stops problems with condensation in the tank and fuel keeps better in bulk so starting it again after winter will be easier. It's not absolutely ideal but it's probably the easiest option.
I leave my bikes uncovered in the garage, I find this minimises the problems with condensation.
Spray metal parts (other than brakes!) with WD40 or similar, oil or grease the chain, spray furniture polish (Pledge or Mr.Sheen etc) works well too, especially for engine and those awkward nooks and crannies. Wash and polish the bodywork just before putting it away.
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