I understand that a ccTLD (or local IP) would be necessary to be found in the local searches. This not important to me because a qualified lead would normally not perform a local search (pages from country), but a web search (pages in language).

I also understand that a mini-site would probably work best.

Although currently, I am limited to only 1 page, and under this circumstance, my objective is what would work best to rank higher in SERPS.

So to benefit from the established domain, the question would be: Is Option 1 better than Option 2?

Would Option 3 (sub-domain) get any benefit from the established domain?

You also mentioned about making it clear to the spiders what language I'm serving. I know about this tag: <meta name="language" content="English" />

Is there anything else I should do?

Thanks