I can't see how the CWGC can duck their responsibility given that they are the organisation with local offices and personnel based where the remains will be found.
I think this Forum has a duty to these men. We have the expertise here and we care. We also have some high profile members who might give credibility to any representations.
It seems from this threat that individual forum members are doing their best to help. Is there a case for doing something collectively with the Forum's name attached to it? Perhaps the trustees could comment.
The CWGC is an unusual multi-national organisation set up in days before DNA testing etc and is undoubtedly legally and financially restricted in what it can do - even if how much they are restricted is not widely known or understood. The fact that they have local offices based where the remains are found might contribute to them being the logical organisation to agree to take on additional responsibilities; but being local does not mean that it is automatically "the organisation" to take responsibility. (I believe both the RBL and the Church of England are also "locally based" - as may be HM's Consular Service).
I am not sure how "this Forum" can have a duty - lacking any collective identity beyond the trustees, and trying to attach the Forum's name to any endeavour could be controversial. If you want an organisation to campaign, it needs to be "an organisation" and one to which you can choose to subscribe (because that helps create a mandate). That is why I suggested in an earlier post that the RBL and WFA (both membership organisations) might be suitable campaigning organisations. They may also have had recent relevant experience in campaigning in respect of the Fromelles remains. WFA is effectively trans-national and the RBL has sister organisations in other countries (which is important given the multinational aspect of this issue). Both are able to formulate strategies and (within their own constitutions) ask for a mandate from their memberships; the Forum trustees can only "put 'it' to a poll".
I believe that RBL and WFA members use this Forum.