بسم الله الرحمن الرحيم
It is necessary that the woman accompanies some mahram during hajj or umrah. Bahnoi, according to Shariah, is not a mahram. Thus it is not lawful for your Sali to go for umrah with you and your wife.
Allah knows Best!
Darul Uloom Deoband
This answer was collected from the official ifta website of Darul Uloom Deoband in India.