I know some do make this conversion this but I expect it is a bit hard on the back when it comes to nadiring, unless one wants to make a king-size Gatineau lift (
http://warre.biobees.com/lift.htm ).
I took the approach of keeping the two systems separate. My first two Warr
és were populated from Nationals, a UK frame hive not unlike a Langstroth:
http://www.dheaf.plus.com/warrebeekeeping/warre_experiment_heaf_2007.htm .
Thereafter I just used swarms to start Warr
és. The bees in the frame hives that I used went on to raise new queens, so I used the procedure to make increase.
Last year I started converting my remaining 3 National colonies to foundationless comb by just using starter strips in the frame.
Some 'grow' National and Langstroth colonies (including nucs) down into Warr
és using an adapter board and then remove the frame brood box when it is free of brood:
http://warre.biobees.com/hiving.htm .