C2000 Hardware Interrupt Block can not be moved into RAM for execution

The C2000 Blockset provides the option to move functions into RAM with the Block Parameter settings of a Subsystem. However, the Hardware Interrupt block does not have this option enabled. I know that this is possible with handwritten code. Is there a workaround for this problem?

Moving it inside a subsystem does not solve the problem, and removing the Mask is not an option. Using only one function call instead of one function call Generator and Function call Splitter also doesn't work. Changing the Code Mappings to use code_ramfuncs as default does not effect Asynchronous Calls.