[NTG-context] Letter with letterhead

Hello, I must write a multi-page letter with only the first page as (pre-printed) letterhead. I adapted the Letterhead example from the wiki to fit the style of my institution. I would like to know how to revert the second and subsequent pages to use a default layout. If someone know how to use Wolfgang's letter module (in MKII) with letterhead on the first page only, that would be fine. Thanks, Roger