wixsharp: More problems with mixed x86 and x64

I am trying to create an installer that

1. Installs into Program Files and not Program Files (x86)
2. Creates registry keys both in Software and in Software\Wow6432Node
3. Creates a folder in ProgramData

First thing I do is to set the Platform to x64, so this is a x64 installer.

Now, wix# seems to be adding all RegValue instances to the first directory it encounters (reference). But this fails because the first directory is the ProgramFiles64 directory (“error LGHT0204: ICE80: This 32BitComponent Registry38 uses 64BitDirectory ProgramFiles64Folder”).
Then I tried to simply move the folder in ProgramData to the first position. This fixes the compilation errors, but now it thinks that this folder is the installation directory.
Next, I tried to give the actual installation directory several IDs that I hoped would help. I tried INSTALLDIR and INSTALLDIR_ABSOLUTEPATH. This seemed to confuse the system even more, because now, the [INSTALLDIR] variable which I use in a regvalue got expanded to C:\ProgramFiles64Folder. Also, the property INSTALLDIR_ABSOLUTEPATH is always set to the first encountered directory (reference).
Finally, it seems to be impossible to add a RegValue to a Dir, to manually choose the directory it should be contained in (reference)

I am not sure how to proceed from here.