Welcome to the Cichlid Room Companion! It is the most up to date site on the internet. I would encourage you to post your pictures in the public forum, either under the Madagascar section or in Taxonmy. Please let them know about your plight as well, and I am sure someone will be able to ID your polleni and be able to point you in the right direction.http://www.cichlidae.com/forum/index.php
Here in the US we are jealous of all the wonderful knowledgeable cichlid keepers in Europe, and there are many cichlid clubs in europe, nearly in every country. You should be able to reach out to them and and get some ideas of what your possibilities are going to be. I will warn you that the relationships between the "zoo world" and hobbyists has been rocky in the past. However most people in the science world agree that hobbyist's observations of fish in the aquarium has helped both parties understand and appreciate cichlids more.http://www.cichlidae.com/clubs/default.php
In the United States we have a group called CARES that is a species maintenance program. Many fish that are at risk, endangered or extinct in the wild are listed and hobbyists commit to breed and pass around the fish. The attitude is that we can not save all the fish, but if each of us could maintain at least one of these at risk species, then we can at least keep them going. There is even some talk of re-introduction in to the natural habitat, which is another debate. There are several species of Madagascar cichlids on the CARES list. http://www.carespreservation.com/
It does seem that the interest in Madagascar has slowed down. I think it is a combination of things, bad economy, fish are a luxury. Some hobbyists like to keep the fish for a couple of years and then move on, and want to keep the next latest rage in cichlids. Most of the Madgascar cichlids get much larger then the size of the average persons tank (55 GAL). And they only have one tank, Madagascar's are not the best community type fish. I do know that they are breeding some species commercially, but with the demand falling, it is hard to say just how long they can afford to do it.
As far as DNA research, I would go to the catalog here on CRC and find the latest reference or citation and perhaps you can track that person down, or track down where the holotype is. It is going to be tough though, alot of the work done on these fish was many many years ago.http://www.cichlidae.com/gallery/default.php
Hope these ideas will help you further your projects with Madagascar Cichlids!