Question
The problem is I need to do this at scale, quickly, in a whitehat way. I thought about pinging, hiring guys on Fiverr to submit to social networks or using Scrapebox's rapid indexer add-on - but I think that all of these solutions are going to look mighty suspicious to Google and result in penalties.
Answer
Well, if so, there are steps to do it yourself, but the most important step according to me is URL inspection, once you do it well, delivering sitemap information to Google helps because it will be queue up for crawling and all the URLs in there should get indexed quickly if they meet Google's quality standard.
Besides if you do have any questions give me a call: https://clarity.fm/joy-brotonath