I asked this question on the Discord server a while back and got an opinion, but I wondered about it again recently, so I was curious to hear other opinions. Can the prefix trick be used with -lu'? For example, vIleghlu': I was seen Or do we have to make the indefinite subject explicit, with vay': mulegh vay': Somebody saw me
I don't understand how this has anything to do with the prefix trick. vIleghlu' is the normal way to say I am seen*. The prefix trick becomes involved when you're using a verb prefix to indicate an indirect object instead of a direct object. I suppose the question might be whether something like jIHvaD ghaH chuplu' He is recommended to me could be altered via the prefix trick: would it be ghaH vIchuplu'? I don't see any technical reason why it couldn't be done, but as you say, it has never been seen in canon so there's no supporting evidence for it either.
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