"... Capture::Tiny ... not immediately clear to me how I would use those while sending info to the STDIN ..."

Looking at other responses you've posted in this thread, I do see STDIN mentioned. I didn't notice that when I first replied: Capture::Tiny probably is unsuitable.

IPC::Open3 is part of the core Perl distribution; if that turns out to suitable (ACL-wise), then there's no installation requirement.