I agree, Ithink you could batch sparge - don't know how it would effect efficincy and it would likely take just as long as fly sparging.
If it was me I would:
1) Drain the MLT first runnings - pumped to kettle,
2) Pump the sparge water to top of MLT
3) Recirc MLT for xx minutes (IDK 15 minutes maybe?)
4) Drain second runnings to kettle
