LONDON — Keir Starmer wants to strike a pick-and-choose deal for access to the EU single market. But he faces an uphill battle convincing Brussels. With his government struggling in the polls, the British prime minister is doubling down on one policy area that’s going down fairly well: his Brexit reset. Buoyed by a largely drama-free political reception to rapprochement with Brussels, Starmer wants to take the U.K. further into the bloc’s single market — but only the bits that suit him. Under