Subjunctive Usage: If there were your help

I am an assistant English teacher in Japan. My JTE (Japanese Teacher of English) was asking me questions about the subjunctive mood.

We were talking about sentences such as:

Were it not for your help ... If not for your help ... But for your help ... (This one actually threw me for a loop at first)

These sentences all use "your help" as a noun.

Then he proposed the sentence:

If there were your help, I would finish quickly.

My immediate reaction was nope nope nope nope nope. It sounds so wrong to my ears. But, not having an English degree, and only going on being a native speaker, I can't explain WHY this is wrong (or if it is actually wrong).

My suggested versions were:

If you were to help me ... If I were to have your help ...

So now I need YOUR help! Is "if there were your help" wrong and why is it wrong?