I’m not exactly sure how the ANC base works, but the schedules are 20 on/10 off and all on/off days are grouped together. Occasionally a KA pilot will cover for other bases, but unless you are a “float pilot” (not to be confused with a floatplane pilot lol) you would be flying out of ANC.
As far as Lear SICs go I really don’t know much, but if you have specific questions I do know one pilot who recently got checked out in the Lear as an SIC and I can pass along questions.