Sorry to be the 'bad cop' but I'm afraid I would have to say that I can see nothing of any merit in these 'tsuba shaped objects'.
The fact that there is a mash up of copper in the nakago ana means nothing in this context. It's no big job to do that sort of thing and in any case I can't see any convincing evidence the copper or seppa-dai ever saw any meaningful service on a mounting. The roughening up of the nakago-ana edges is very contrived and awkward, they're trying far too hard to be old and much used. And yet the nakago-ana themselves are still quite sharp inside, even though the shape of the openings are pretty bad.
I wouldn't be so harsh as to call them fakes per se, rather these are, imo, amateur hobby work and probably a few decades old at best. As a hobby this type of work was evidently quite common in the mid 20th century in Japan. They were probably 're-discovered' long after granddad died looking convincing rusted and aged through neglect. They're evidently copies of older models but a lot has been lost in the transfer of the design and even more in the execution. This is not the work of a trained metalsmith.
The iron is featureless mild steel, the patina is very superficial because it's really just a cleaned rusted bit of steel, and the workmanship is very uncertain. The ryohitsu shapes where they abut the seppa-dai reveal a lack of understanding of how kogai and kozuka lie in line with that face , and the chamfering on the lens shaped opening on the Owari copy is a bit fanciful, to say the least.
It does concern me that there are so many pieces like this easily available on-line for tempting prices and I can well appreciate the urge to take a punt to acquire a tsuba at a bargain. But I think it safe to say that in a fairly short period of time the shortcomings of this sort of 'bargain' will soon become self evident. As to where they might fit in, I don't think they do.
I'd suggest that new students of tsuba stick to dealing with people we know well and regularly interact with here on this forum. Grey Doffin would be my recommendation to start. He always has a good spread of very modestly priced yet interesting and perfectly legitimate Edo period iron tsuba. And never be hesitant to ask for advice or guidance before you part with your hard earned cash, I. for one, am always happy to offer an opinion.