I don’t think E10 is a good place to store risk assessment. If you need to regularly re-calculate it on a product by product level, you’d need to assign some factor to each element of the MOM, and then develop a system to “roll-up” the risks to give you some sort of factor.
Think of it like a cost roll-up. Each part has “risk” (and as @Vinaykamboj pointed out there are various sources that contribute). Instead of rolling up the costs, you’d have to roll-up the risks.
Now how you assign the risk level to each part, operation or resource, is entirely up to you. Say your finished part needs to be manufactured on a very specialized machine. If you have only one of that machine then the risk related to that resource is high, as you can’t make it with out that machine. If you have 5 of that machine your risk for that resource is lower.
I don’t think I would try to do the risk tracking of the MOM elements (parts, operations, resources, etc…) in E10. An Excel spread sheet that you could paste an MOM into would be the path I’d go. Then I can fine tune my risk factors for each element, with out having to go into E10 and update all those elements individually.