Cancelling Reward flight 2nd leg after flown outbound?

[shub]

Hi,

I need some help in figuring out best way to handle change in a Virgin Atlantic reward flight booking. The booking was made before the dynamic pricing so the change fee should still be £30. The outbound flight in Mid July is fine and I’m planning to use it.
The return leg however, I would like to postpone by 2 weeks. It was originally booked in PE, now with Dynamic pricing it is currently at 50,000 points which to be honest I’m fine with as have companion vouchers as well to use.
The issue is that the outbound leg is now 105,000 points in Economy and much more in PE and Upper. So, I can’t change the return leg and presumably whole trip will be recalculated?
There’s inbound availability with BA as well which I can use if needed. But can I cancel the return leg of my VS trip after flying outbound? Will I get half or any points back?
cancelling the whole trip would mean loosing companion voucher, a well planned and relatively well priced itinerary and will have a good stash of VS points not entirely sure when I can use them.

Thanks