Hi Hester. The curse of OSR - I think not, love the stuff and missed it last year with the rubbish weather!
Yes the bee's will use it but on a good year you could be adding a super every 10 days - that's a lot of honey. In the wild I suppose they would fill the space and then swarm to a new site leaving behind a queen cell (or 10) to continue. Make sure you have enough supers to allow the colony to expand.
Plan for some good weather and a bumper crop of honey

Extract the OSR shortly after the flowers have wilted, make some creamed honey for your toast
Then watch the Autumn crop build up and make a decision on leaving some of that for the bee's to over winter