In case anyone is interested, here's the script I used to reocnstruct the document back into Laserfiche. For my convenience, I'm running it from Workflow.

Imports System
Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Data
Imports System.Data.SqlClient
Imports System.Text
Imports Laserfiche.RepositoryAccess
Imports Laserfiche.DocumentServices

Namespace WorkflowActivity.Scripting.MergeQuickFieldsPagesScript
    '''<summary>
    '''Provides one or more methods that can be run when the workflow scripting activity is performed.
    '''</summary>
    Public Class Script1
        Inherits RAScriptClass102
        '''<summary>
        '''This method is run when the activity is performed.
        '''</summary>
        Protected Overrides Sub Execute()
            dim oDoc as DocumentInfo = Nothing
            dim intEntryID as Integer = 0
            dim strFullPath as String = ""
            dim strStartPath as String = "C:\ProgramData\Laserfiche\Quick Fields\Files\ed5da3f7-0735-4d61-80a8-6b301ae12eb0\7\106\12\38"
            dim strExtension as String = "TIF"
            dim strMergedName as string = "merged file"
            dim strLFPath as String = "\"
            dim oLFPath as FolderInfo = nothing
            dim oImport as New DocumentImporter
            dim oOCROptions as DocumentImporterOcrOptions =  nothing
            dim i as Int32 = 0

            oLFPath = Folder.GetFolderInfo(strLFPath,me.Connection)
            intEntryID= Document.Create(oLFPath,strMergedName,EntryNameOption.AutoRename,me.Connection)
            oDoc = Document.GetDocumentInfo(intEntryID,me.Connection)
            odoc.Lock(LockType.Exclusive)
            oOCROptions = oImport.OcrOptions
            with oOCROptions
                .AutoOrient=False
                .Decolumnize=False
                .OptimizationMode=OcrOptimizationMode.Balanced
            end With
            oImport.Document=oDoc
            oImport.OcrImages=True
            for i=0 to 2047
                strFullPath=string.Format("{0}\{1}.{2}",strStartPath,i.ToString("X8"),strExtension)
                if System.IO.File.Exists(strFullPath) Then
                    oImport.ImportImages(strFullPath)
                end If
            next i
            oDoc.Unlock
        End Sub
    End Class
End Namespace

Does this script recover original file names? Is there a way for it to work through the subfolders under the Files parent folder?