Current low gear is 30/34 (1:0.88), high gear 50/11.
Proposed new low gear 34/34 (1:1) or 34/32 (1:1.06) and 53/11 high gear.
I suggest simply getting an other cassette. 11-30 or 11-28. That brings a 30/30 (1:1) or 30/28 (1:1.07) low gear and a 50/11 high gear. Almost exactly the same as proposed.
Unless you absolutely need the slightly higher high gear, replacing the cassette is likely cheaper and easier.