Have you ever considered that solutions to your perceived problem might exist?

I’ve done multiple different takehomes with some kind of time limit in place to avoid that sort of thing. Tools have this built in.

Also, there are definitely candidates who would prefer a takehome. If you’re worried that a takehome might be unfair, you can offer folks a choice to either do the exercise on their own async, or to do it live pairing with you. You might be surprised by how many will choose the former.