Lily & Matilda as siblings

What are your thoughts on Lily & Matilda as siblings ? We currently have a 5 year old Lily and I’m pregnant with another girl. I love love love the name Matilda and really want to use it (nn Tils, or Matt) but am hesitant because of Tilly being the most common nickname OTHER people might use. Hoping as she got older she would know to either introduce herself as Matilda or one of her other nicknames…
I just love the name Matilda as it is, without wanting to use Tilly.
Other names we are considering are: Daphne, Penelope & Hazel

Be honest & if I’m crazy talk me out of it 🤣