Pronatalist.org is not an EA group. It’s great that EA considerations have started entering the public consciousness and I would love if every charity was expected to answer “why is this the most effective thing you could be doing?”, but that doesn’t mean that any group claiming their mission is really important is part of EA. It’s very difficult to argue a rigorous case that promoting pronatalist sentiment is an effective use of money or time, and so far they haven’t.
Rather than ask how we can build more (and better) groups, ask whether we should.
Does the LTFF ever counter-offer with an amount that would move the grant past the funding bar for cost-effectiveness? I would guess that some of these hypothetical applicants would accept a salary at 80% of what they applied for, and if the grants are already marginal then a 25% increase in cost-effectiveness could push them over the bar.