I don't see why not, you're just putting your equipment next to someone who's definitely on your side after all. Just be aware they could still shoot a koala to generate the template. If they deploy deep in a corner it looks like you could even block them with the Lunokhud's silhouette alone. Correct me if I'm wrong, but an unconscious REM stays on the field as an S4, right? So the Fiday would need to dump 3 wounds into it to even remove the roadblock.