Costly HASH MATCH Aggregate
This is not a full answer, but I need more room than a comment allows, so...

First, you should consolidate your query - you have an unnecessary step in it:

INNER JOIN (
    SELECT Report.Id ReportId, Max(COALESCE(SupplementNumber, '0000')) RecentFormNumber
    FROM dbo.IncidentDetailsPages detailPage WITH (NOLOCK)
    INNER JOIN Form WITH (NOLOCK)
        ON detailPage.FormId = Form.Id
    INNER JOIN Report WITH (NOLOCK)
        ON Form.ReportId = Report.Id 
    INNER JOIN dbo.IncidentDetailsPage_Incident incident WITH (NOLOCK)
        ON detailPage.Id = incident.PageId 
    LEFT OUTER JOIN dbo.IncidentDetailsPage_Supplements supplement WITH (NOLOCK)
        ON detailPage.Id = supplement.PageId
    GROUP By Report.Id
    ) RecentForm


Second, you should get rid of the redundant use of the Report table, ending up with a query like this:

CREATE VIEW [dbo].[CurrentIncidentStatus]
AS
SELECT [incidentDetails].[IncidentStatus], 
    [incidentDetails].[IncidentStatus_FieldValue], 
    [incidentDetails].[IncidentStatus_Description], 
    Report.Id ReportId, 
    Form.Id FormId
FROM [dbo].[IncidentDetailsPage_Incident] incidentDetails WITH (NOLOCK)
INNER JOIN [dbo].[IncidentDetailsPages] detailsPage WITH (NOLOCK)
    ON incidentDetails.PageId = detailsPage.Id
INNER JOIN Form WITH (NOLOCK)
    ON detailsPage.FormId = Form.Id
INNER JOIN Report WITH (NOLOCK)
    ON Form.ReportId = Report.Id
LEFT OUTER JOIN dbo.IncidentDetailsPage_Supplements supplement WITH (NOLOCK)
    ON detailsPage.Id = supplement.PageId
INNER JOIN (
    SELECT Report.Id ReportId, Max(COALESCE(SupplementNumber, '0000')) RecentFormNumber
    FROM dbo.IncidentDetailsPages detailPage WITH (NOLOCK)
    INNER JOIN Form WITH (NOLOCK)
        ON detailPage.FormId = Form.Id
    INNER JOIN Report WITH (NOLOCK)
        ON Form.ReportId = Report.Id 
    INNER JOIN dbo.IncidentDetailsPage_Incident incident WITH (NOLOCK)
        ON detailPage.Id = incident.PageId 
    LEFT OUTER JOIN dbo.IncidentDetailsPage_Supplements supplement WITH (NOLOCK)
        ON detailPage.Id = supplement.PageId
    GROUP By Report.Id
    ) RecentForm
    ON Form.ReportId = RecentForm.ReportId 
    AND RecentForm.RecentFormNumber = COALESCE(supplement.SupplementNumber, '0000')
GO


With these simplifications, please check the query plan again.