Entities 0.17 Bootstrapping Unmanaged Systems

Prior to version 0.17 I was using ICustomBootstrap to remap some default system groups in a custom world. I reimplemented AddSystemsToRootLevelSystemGroups so that I could remap update groups during bootstrap depending on the world that was being bootstrapped. The latest update changed that method to accommodate the unmanaged systems, and it uses the internal SystemHandleUntyped type which means custom bootstrap methods can’t manually create unmanaged type handles or bootstrap unmanaged systems. Is there any workaround for this? Or is there a better way for a custom bootstrap to modify the system groups?

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Necroing this because I haven’t seen any updates. Is there a workaround (now or planned) to use custom bootstraps with unmanaged systems?