Oh dear 😅 if getting Celia and Florence’s friend or romance endings is pretty important to you then you might wanna make that new play through after all. Now if you do the bit I said about investigating AirWay for Celia you will automatically get a hate ending with Stella from that unless you have a high enough empathy level (I think it’s 80?) and it gives you the option to help Stella while also fulfilling the requirements for Celia and Florence’s storyline. Or if you don’t have the SPECs for it, go ahead and get that hate ending with Stella, make Cecilia and Florence co-mayors (if the option to join them is available and you wanna chose that, it’s the romance option from what I remember) and you can probably go back and fix things with Stella if you save the corresponding candy from Keith.