Using the right question tags

[Daemon99]

We are having the party tomorrow, is it?
He hasn't come to the office, is it?

Can someone please tell me if the above sentences are natural? Can we use is it in such situations? It's very common here in India. Can it be considered an Indianism?
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Non-native speaker of English
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I intend to live forever - so far, so good.

[Kitosdad]

Good morning Daemon.

We are having the party tomorrow, aren't we?

He hasn't come to the office, has he?

Can it be considered an Indianism?

Don't know the answer to that one mate, but it sounds as it may be so if in common usage.

Bill.
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Keep it simple ... Keep it interesting.

[Daemon99]

Thanks a lot, Bill!

Let's see what the other native speakers have to say about this?
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Non-native speaker of English
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I intend to live forever - so far, so good.

[Skrej]

Hi Daemon,

From an AmE perspective, both of those tags sound very unnatural to my ears.

Not sure about the Indian English aspect.
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Plan to be spontaneous tomorrow.
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[Daemon99]

Thanks a lot, Skrej!

What if I replaced is it with is it so in those sentences? Would it be OK then?
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Non-native speaker of English
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I intend to live forever - so far, so good.

[Nasrawy000]

the first answer is : aren't we?

the second is : has he?