Wallenstein rhymes with:
borenstein, fleckenstein, frankenstein, goldenstein, grabenstein, hartenstein, liechtenstein, lowenstein, rosenstein, borenstein, brandenstein, brownstein, burnstein, feinstein, fleckenstein, frankenstein, goldenstein, grabenstein, greenstein, hartenstein, hornstein, liechtenstein, lowenstein, reinstein, rheinstein, rosenstein, weinstein
Wallenstein sounds like:
wallington, wellington, williamstown, wilmington