Indeed us-west-1 currently has no quicksight available. Once we receive more customer demand we can prioritize.
Regarding Resource links - cross region via lakeformation with resource links is possible.
From another post:
Ensure the following permissions are configured in Lake Formation (in account where resource links have been created.)
-Grant describe (permission + grantable) on the resource link to QuickSight user/group arn.
Ensure that you are using QuickSight arn and not iam arn.
-Grant on target on the resource link with select (permission + grantable) for QuickSight user/group arn. (Selecting all tables option is causing error in LF; Selecting needed tables explicitly works.)
Cross check the following in source account’s Lake Formation.
-Ensure that the s3 bucket is registered as a data location in Lake Formation.
(Usually will already be done; Cross check for public buckets as they would work from Athena even without this, but will work from QuickSight only if explicitly registered in Lake Formation)