Various notes:
- LowestStartingAddress is still unsupported; - Patch 5 ("wow64: Set HighestEndingAddress in wow64_NtAllocateVirtualMemoryEx() if it is absent") is fixing existing WOW issue: NtAllocateVirtualMemoryEx() called from wow64 currently does not constraing the allocation to 32 bit address space (wow64_NtAllocateVirtualMemory() passes zero_bits for that). - I initially thought of using a single inter process APC but added a different one due to zero_bits handling which is easier to convert in the target process.