I finally found the solution myself by retrying later and with a bit of rewording in the searches. A page of the MSDN explains the syntax to re-enter the CLR-realm from a bare address.
The syntax is the following:
{CLR}@address
where address
is your bare address, e.g. 0x0000007f12345678. The CLR/debugger will apparently happily figure out for you the type of the data pointed by that address, no need to specify the typing (of course the CLR knows the type, doesn't it!).
E.g.: {CLR}@0x0000007f12345678
Here's a quick screen capture with a managed string in C#: