Pretty simple really. Fly scratch built planes with spikes at an oversize dart board. You could fpv it but I don't think it is necessary.
Just an idea for fun.
RC darts sound like a hilarious and creative idea! Building little planes with spikes and turning a regular dartboard into a giant target seems like a ton of fun. I think it would be perfectly enjoyable to fly these planes line-of-sight, letting you focus on piloting skills and precision. FPV might be a bit too intense for something meant to be lighthearted. This could be a great UK top 5 writing websites way to get together with friends and have some laughs something I'd be up for trying!