No, runtimeShell runs on the host platform for a given package set. When makeWrapper is a nativeBuildInput, its host platform is bmon's build platform. You can verify this by evaluating pkgsCross.<platform>.buildPackages.runtimeShell.
The only way I can see to make it work as a nativeBuildInput is to use shell = pkgs.targetPackages.runtimeShell. On the other hand, that would break it if it was used as a buildInput.
This is not the first time this fix has been needed: #58305
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