How do I ask other nodes for their stale blocks? I want data on as many stale blocks as possible. Is there a way to ask peer nodes to run "getchaintips" and get their results?

Previously, I used Blockchain.info's API call for this, but it seems like they deleted their data on stale blocks (even when I directly search for a known stale block's hash, no results are found).

I've also heard of using merged mining data to find extra stale blocks, per Stifter et al 2019. This method was used to find many stale blocks that weren't propagated to nodes run by certain websites; the paper looks at stale blocks from Decker and Wattenhoffer 2013, Blockchain.info, Bitcoin.com, and ChainQuery.com. However, this method misses many stale blocks that those websites picked up.

My current best idea is to ask as many peers as possible for their "getchaintips", but I don't know how to do this. Can someone help, suggest an alternative method, and/or provide some of their own data?
You can’t. Nodes don’t respond to messages about stale blocks because this would be a fingerprinting vector.