If the dad’s dead, it’s a discontinued line; doesn’t necessarily mean he won’t be selling it, Black Triangle recently made an appearance in seed banks again when he broke it out of the vault. When the first co-ops were getting started this question came up, and he didn’t seem to mind a DBHP co-op even while seeds were still being sold because the dad was dead.
Given that, I’d say you’re clear to do whatever you want with them. If you want to only give them away to people who are gonna grow them immediately, IMO you’re probably best off continuing with the expectation that people run them as testers and report back. Even then you’re gonna get burned occasionally, but that’s the best way to make sure they’re actually grown soon. Most of the regulars on the forum simply don’t have the room to grow anywhere near all the seeds we’re all making, so if you pass them out freely, most of the people who take them aren’t gonna grow them any time soon. I know I wouldn’t say no if you’re trying to get them out there, and I know just as well that they’d end up sitting in my fridge for a while… who knows how long. 
Anyway, looks like as long as you’re not selling them, it’s all good; you could ask the co-op to distribute them, do a single mass distribution yourself, or set up camp in @minitiger’s thread and run a wiki giveaway every hour for maximum possible spam opportunities. I’d be a little amused to see that, personally. 
Though somehow I think we might see one or two fights starting…