Conditional tense English speaker help

When using the conditional you can only use 'if' and not when. Can a question be in the conditional?

AWho in their right minds would buy the old one when the new one is available?

BWho in their right minds would buy the old one if the new one is available?

CWho in their right minds would buy the old one when the new one was available?

DWho in their right minds would buy the old one if the new one was available?

EWho in their right minds will buy the old one when the new one is available?

FWho in their right minds will buy the old one if the new one is available?

When using the conditional you can only use 'if' and not when like thus

He wouldn't buy that if the new phone came out.

You wouldn't say

He wouldn't buy that if the new phone comes out.
He wouldn't buy that when the new phone came out.
He would't buy that when the new phone comes out.

It stands to reason that when saying
Who in their right minds would buy the old one when if the new one is was available?

Who in their right minds will buy the old one when the new one is available?
Who in their right minds will buy the old one if the new one is available?

It's a simple conditional if I'm not mistaken.

So D,E,F are correct in my opinion. Is that correct?

Is this a first conditional?
Why would I say 'no' to a job if I didn't have money?

If it is than isn't it wrong to say: Why would I say 'no' to a job when I didn't have money?

Is this a first conditional?
Why would I buy it here if I could buy it there?

If so wouldn't it be incorrect to say
Why would I buy it here when I could buy it there?

Is this the 2nd conditional?
Why would I have bought it here when I could buy it there?
Why would I have bought it here if I could buy it there?

Can a question be a conditional? Maybe it cannot. I don't know.

When would I do it if I didn't do it now?
When would I do it if I don't do it now?

Thank you for your time.