Forte
I am on a similar excursion, for Forte "cold tone"- Omega Satter is their US
importer of record, and the Forte web site lists their cold tone paper, Bromofort. I think the best solution is to either buy Forte from a retail shop in Hungary, pay the freight, and go on down the road.
The alternative is to convince the importer to stock or special order what you need; that is a possiblility, i.e. get some of us to chip in on an order.
We should keep in touch, maybe one of us will get lucky.