For me – since I use two poles for hiking, I don’t usually consider weight as an issue – I never keep it in my backpack and carry it.
If you are actually just going to use the pole for the tent and not using it for hiking, then you may want to check out MLD – they seem to have a 57 inch (or is it 59inch? – check with MLD) one for DuoMid XL at 4 oz at $65. Of course, I think hiking poles are stronger than tent poles – but, if MLD is selling it for their DuoMid XL, I would trust it completely. Maybe some MLD users can chime in.
Zpacks has the Trekking pole Jack which adds 12 inches at 1.2 oz – which is the lightest and cheapest.