Minimal decomposition for a 4 qubit QFT in a Superconducting architecture

i'm looking for a minimal decomposition in terms of Cnot for the 4 qubit QFT circuit in the 7 qubit architecture reported in figure. I'm using qubits 0,2,4,6 as ancillas for my QPE algorithm. The qiskit transpile option give me a 51 cnot long circuit but i'm trying to figure out if there is a better decomposition