I don't believe they will be "actively" trying to do so, but IMO they certainly do not go out of their way to assist.
Opportunities to help the islands have been put in front of the iRB before, such as the proposal to allow players born in a Tier 2 country, who have played for a Tier 1 country, to make a one-time permanent switch back to the country of their birth. This proposal has been fronted several times to the iRB, and has been "block voted" down by the Six Nations Unions, using their double voting rights.
Also, the proposal for an iRB funded Pacific Nations Championship was turned down several times since 1996, again by 6N block voting, before finally getting the go-ahead in 2006. It took TEN YEARS to get the "57 Old Farts" off their collect fat-arses and make them see something other than the bottom of their "pink gin" glasses.
Similarly, it seems they are unwilling to have the period of time the PNC is run, recognised as an official iRB window. This means they have no leverage when it comes to to getting their players back from Europe to participate.
Possibly, Charles is right when he says England and France wouldn't fall into that category, however, I cannot see that having strong Fijian, Samoan and Tongan sides would serve the interests of any of the Celtic Sides.