Will a tourist SIM or eSIM work for Korean ticketing verification?

Usually not. Short-term tourist SIMs and most travel eSIMs are not registered to your name with a Korean carrier, so they cannot complete the 본인인증 phone check the Korean apps (Interpark, Ticketlink, Melon Korean) ask for. That is why those apps are so painful for visitors. The way around it is to buy on the global English sites, which do not need a Korean number, or to have someone in Korea with a registered number help you.