Hi Leon,
good question, the simple LCIA method that exist so far for social LCA has the only function to aggregate the different risk-assessment classes (low risk, medium risk, high risk, ..) into one figure per indicator. For the direct calculation, this is not needed as you do not have different risk levels but are already at one result per indicator. Therefore, a specific LCIA method does not exist here. However, this shows that there could be a task left for developing a maybe more integrated LCIA method that combines different indicators..
All the best,
Andreas