Is there a way to update a node property sheet changing the engineid

I have up to 1 to 500 devices added per day and I need to change pollers after so many devices added before I add the interfaces so I don't overload the pollers

I can retrieve the information and engineid fine but now I need to update the property sheet.  I am running with 22 pollers.

$sourceNodes = Get-SwisData $swis "SELECT Uri, IPAddress, MachineType, Caption, NodeID FROM Orion.Nodes where IPAddress = '$ip'"

  foreach ($sourceNode in $sourceNodes)

   {

  $targetNodeUri = Get-SwisData $swis "SELECT Uri FROM Orion.Nodes WHERE IPAddress=@ip" @{ ip = $sourceNode.IPAddress }

  $ip = $sourceNode.IPAddress

  $nodeId = $sourceNode.NodeId

  }

  $existNodeProps = Get-SwisObject $swis $targetNodeUri

  $m1 = $existNodeProps.Get_Item("MachineType")