AutoCAD Inventor :: ILogic Automatic Change Of Drawing Title Block?

I am currently working with fx parameters and iLogic to drive a model and it's corresponding drawing to change based on a single user parameter.

I have managed to get the drawing to update both the scale of the views I need and the size of the sheet with the change in parameter using the following rule:
 
IfParameter("EB75551.ipt.Rise")<1801Then
ActiveSheet.ChangeSize("A1", MoveBorderItems :=True)
ElseIfParameter("EB75551.ipt.Rise")>1800Then
ActiveSheet.ChangeSize("A2", MoveBorderItems :=True)
EndIf

However when i attempt to use this with the title block using the function:

ActiveSheet.TitleBlock="My Title Block"
in place of the sheet change size it brings up the error message:

Error in rule: Drawing Title Block, in document: Drawing

The parameter is incorrect. (Exception from HRESULT: 0x80070057 (E_INVALIDARG))

I have read elsewhere that this is due to me having prompted entries for the scale and drawn by fields, however when i use the function designed for prompted entries: ActiveSheet.SetTitleBlock("Other Title Block", "promptedEntry1", "promptedEntry2")
It fills in the prompted entry fields from the code and if i change these entries in the "edit field" option they are overwritten when it is updated.

Is there a way have the prompted entries when you open the drawing fill in the "promptedEntry1" field in the rule so that I can use the rule? Or am I going about it the wrong way?

I should point out i'm new to iLogic and no-one in my workplace can use it so each person changing the "promptedEntry1" field to the scale they wish isn't a wise move.