Halifax, Sheffield Eagles, Featherstone, Barrow and Leigh have so far refused to enter into partnerships with Super League clubs which provide surplus players for the Championship teams.
Four of them - Barrow were unable to attend Thursday's meeting - have signed a memorandum of understanding vowing to curtail the use of dual-registered Super League players and have called on the other 10 Championship clubs to follow suit.
They argue that the system undermines the integrity of the Championship and denies opportunities for existing Championship players.
The memorandum calls for clubs to agree:
- to not select dual-registered players aged 23 or over or are among a Super League club's top-20 earners;
- to select no more than four dual-registered players at any one time;
- and to not select players for the end-of-season play-offs who have appeared in fewer than 50 per cent of their Championship matches.
Halifax chairman Michael Steel said: "It is the view of the present signatories that there is nothing in this memorandum which should prejudice the proper operation of the player pathway."