If they have demos, it seems puzzling that they won't offer stand-alone units for these rather than them being available only through upgrades. The argument brought up prior by someone else that the additional tubes won't fit some ears isn't really an argument against having them offered as a stand-alone offering. With many CIEMs like the SE5 the fit not being for everyone seems to be the case as well.
Anyways, hopefully they come up with some other option in the future.
Keep us updated on when they have those 335DWSR available (I'm just going to refer to them as that from now on)....
Are the demo units to be in store/on location, or are they to be shipped via some sort of tour/person-by-person process by request? Actually the latter sounds ridiculous so it's probably not even that.
Who knows (well actually, probably only Suyama-san knows ;))? They may offer standalone units in the future.
But I think the main point I was trying to make is that these Studio References are really so early in the public game that they're not even ready to accept upgrades but just for testing at the show (BTW, by "the show" I mean the Fujiya Headphone Autumn Festival this weekend).