Cheers, and yeah, that's the approach I take for the "Macy and Denise locked out" route (where both are locked out). Basically, that cuts every bit where the MC is somehow involved in a lewd/romanctic situation/conversation with them, or conversations about him. Some conversations are modified there to shift it into story of exploration and growing romance between just the two girls.
For a while, there were separate lock-out for each girl which I tried to keep going for as long as possible. However, storywise I found that I couldn't keep that up somewhere in chapter 3 I think, as
Denise is the main motivator for driving many of the advances between the MC and Macy, and that in itself is her motivation, and without both on board, all that fell apart. So rather than spinning up three distinct, mutually exclusive story lines, the separate lockouts merged at that point.
One answer to implement your solution would have been to abandon the combined path and and just have two separate paths for each girl, which you can then just show, or hide, depending on the choice. In theory, that would mean either or both paths can be taken, but in practice, it would mean almost zero interaction between them and going to some variation of the "girls camping in their separate rooms until you visit them" scenario I mentioned in the previous post, and that would suck all the life out of it and cripple the storyline up to that point.
As you can tell, some thought has gone into it already over the course of development.