I think you'll need a query with a field calling a VBA function passing your parameters which returns the value from a pass-through query whose SQL is determined at runtime.
If you're calling a function like that for a large number of rows, it will be slow.
For example, you need a pass-through query with your connection to your SQL Server.  I'll call that qry_PT_createRecord.
Then you need a public function in VBA with your two date parameters passed in which modifies the pass-through query's sql property, like:
Public Function g_createRecord(startDate As Date, endDate As Date) As Integer
    Dim db As Database
    Dim qdef As QueryDef
    Dim sql As String
    Set db = CurrentDb()
    Set qdef = db.QueryDef("qry_PT_createRecord")
    qdef.sql = "exec usp_createRecord " & startDate & "," & endDate
    g_createRecord = qdef.Execute
End Function
Then you need a query to display your fields from MyReport, call the function, and return the sp's value, if there is one.  I'll call that query qry_createRecord.  The SQL will look like:
Select 
 ID, 
 startDate, 
 endDate, 
 g_createRecord(startdate,enddate)
from 
 myReport