I did follow those instructions. I also corroborated them with the Developer guide for CR2012 from some of your prior links.
I used AnyCPU as the target arch and the folder where my UFL is is the same folder the U212COM.DLL is. Interestingly, I do not have a listing in the formula editor for ".Net and COM" like I have seem people mention.
Edit 1:
I do not see a way to set 32 bit for certain. I see an item called "Prefer 32 bit", but it is ghosted out.
I think by choosing AnyCPU, it puts the assemblies out as MSIL and is supposed to work in both.