This is the information I got back from GBIF: For these publishers, I see two possible options:
They could install and use their own publishing platform (the IPT is probably the easiest one)
The alternative would be for us to help you/them find another host (someone from the GBIF network).
If it is only a few hundred records we could investigate sharing them from the NBN Atlas. We could also approach GBIF Spain (they have quite a few non-Spanish records and may agree) and I can submit them in Spanish.
NBN Atlas Data Manager