You're fine. I'm in Maine and your regimen is all I have done with my other BMW's (1200R and 1200RT). They'll be fine.
And I usually don't store the bike till the first time they salt the roads...it was well into December last year...and they come out around April once the first good rain washes the salt off. Usually about a 5 month layoff. Others ride all year but I don't want the corrosion issues that may ensue.
2014 R1200R, 2016 R1200RT (Gone but not forgotten); 1971 R75/5; 2018 G310R