So you mean that the client cannot sit in the same room as you?
I think you need to define that you cannot simply come up with sounds at given times, but rather, you need some time to prepare them. Then you can have meetings where you can play the stuff that you've come up with.
You may also explain to the client that your job is not about sounds (it would be, if it's e.g. a sound logo, but generally no), it's about the whole (or the segments of the whole). Therefore instead of having some fairly useless "lets hear the sounds" -meetings, how about having regular meetings where they can approve the parts that you've already done (and if they don't approve, then you can make changes). It makes a whole lot more sense to be interested in the wholes than be interested in the sounds, plus it's more effective (= fewer meetings) that way, plus it may result in fewer adjustments (everything always sounds different when in the context, rather than when extracted from the context, for which there's no good reason). Besides, creative work entails that certain freedom is given, i.e. the client trusts you to do your job the best you can, and there's generally no need to have the watchdog attitude in making sure that you do your job the best you can, because what matters is the results.