Those Pip-Squeaks look like a lot of fun, they remind me of a couple rimfire to centerfire adapters I have laying around somewhere. If I can find them and find the name of them I'll put it in here.

Here's a couple of links to somewhat related products. I have no experience with the convert a pells products but I do have several Dina Arms adapters which come in handy. I didn't know they were still in business but found their website.

Convert-a-Pell *

https://www.dinaarms.com/Home_Page.php