I use 301 shorteners to my PBN and blast social signals and bookmarks to my website. I use 301 shorteners to spam my PBN and money site links on social media to get new pages indexed. I use this exact method to pump up every Web 2.0 property I buy on BHW. I use this method to pump up many PBN posts I buy on and off BHW. I use this method to pump up every Guest Post I earn or purchase.
No one will ever bat an eye at a couple different and unique URL shortener links pointing at there website. I never would. Especially when I use them myself for social sharing. You can easily power an existing link or earned link up without risking anything.
In my experience, when using this for Guest Posts, it works best to use a 301 commonly used on social media. The two most popular I have seen are bitly and googl. This is in part due to tracking abilities and the capacity to have a custom URL.
So if you are going to blast a Guest Post, I suggest you go with one of those.
301 shorteners do not get as much love as they should for being very useful and versatile in SEO.
I didnt really get the last part of OP's sharing.
A) Did he blast social signals and bookmarks to his 301 shorteners or to his money site?
B) Did he post those 301 shorteners on social media to get the pages indexed?