Good luck with Replica! I built something sort of similar for my family (my 8 yo has T1D and a lot of life-threatening food allergies): https://saltie.app. Happy to chat as well, I can create an account for anyone interested, and I can share what I’ve learned in making this.
I formerly used to work in the diabetes management space, and I too would be interested in chatting seeing as I have acquired some modeling expertise in the meantime.