I usually recommend the Roadlink & bigger cassette, but 52/34 is a lot of chain to take up.

Consider biting the bullet and change the whole thing- chainrings to 50/34 or 48/34 (what non-pro needs 52/11?)

11/34 cassette, mid-cage RD, and chain.

I run this on my (older) Tarmac. The 48/34 works very well with less double shifting and more time in the big ring.