That we'll definitely do and test on the ground first.
First, of course, we'll ground control. There will be a long way of training to go till we're able to fly together, close to each other.
Sorry, did I get it right that you used this system for visually impaired jumpers?
How did you managed "pull both breaks" for landing or "let both breaks up" commands with horns?
In paragliding many students tend to pull breaks too much and this can cause a wing stall, so very often we have an instructor yelling "hands up!!!"