I think the risk is to all Rabbits, whether fed fresh forage or not.
This is FHB's thoughts on the issue :
''The risk of transmitting disease from wild rabbits is the most serious concern about foraging for pet rabbits. Rabbit Haemorrhagic Disease (RHD) is easily transmitted, not only via forage, but also on footwear or via insects, crows or foxes. The best way to protect rabbits is to vaccinate them and it is vital that tabbits that are fed on forage are vaccinated against RHD and RHDV2.''
Full text here :
https://www.harcourt-brown.co.uk/articles/free-food-for-rabbits/foraging
Re the supply of the RHD2 Vaccine, my Vet has not had any problems obtaining Filivac. But I was speaking with a Vet based in Yorkshire a couple of days ago and she is having to prioritise most 'at risk' Rabbits atm as she is having a problem obtaining Filivac from her supplier. She said this occurred as a result of the recent recall of a specific batch of Filivac. I'd give your Vet a call to check that they have the Vaccine in stock, I doubt there will be a problem.