2 open enrollment periods

[Guest Cgross]

A self funded plan is offering a HDHP as of May 1 which coincides with their

annual open enrollment period. They have a section 125 plan.

They wish to have two open enrollments in the future; one at the normal time of

May, and one in Dec to allow employees to enroll in the HDHP for the next tax year

if they choose to do so.

I know that elections to an FSA must be for 12 months, but is there a similar requirement for premium only 125 plans?

Can an employee maintain 2 open enrollment periods without jeopardizing the 125 status?

Thanks!