What about Franziskus? Premium Hanoverian stallion who was 4 y/o Bundeschampion last year. Bloodlines are Fidertanz / Alabaster / Rubinstein I / Grundstein I (no Donnerhall in the pedigree). He is approved for Hanoverian, Oldenburg, Westphalian, and Swedish breeding. Dreamscape carries his frozen, but I don't know if it is proven.
Flammengold (Freestyle's full brother living in the UK - http://www.hanoverianstud.com/flammengold.html) Note: Golden Edge Sporthorses in the USA already imports semen from the UK for other stud farms, you can ask them if they would include semen for this boy in their next shipment.