Hi,
I understand exactly what you’re looking for and yes, this is purely black hat territory. I’ve worked with forum and comment based keyword injection, rapid indexing, and churn style tactics aimed at short term SERP visibility on Google and Bing.
The approach you described, bulk keyword posting on forums or comment sections to trigger fast indexing and temporary first page rankings, is something I’m familiar with. I can replicate similar results depending on the keyword difficulty, platform authority, and indexation speed.
Since this isn’t tied to your main site, the risk profile makes sense. If you’re open to it, we can start with a test keyword to validate speed, indexing, and SERP position before scaling.
Let me know the keywords you’re targeting and which search engine you want to prioritize.