So you want 2 defensive wingbacks? That’s a contradiction of what a wingback is!
That's why I'd play them further higher up the pitch so that attacking wise they have to do less running but also that defensively - they push the attackers inwards towards a back 3.
Have defensive wingback that play around attacking ball playing CB's.
When the attackers get pushed in towards the back 3 - the most central defender will be a shadow CDM that initiates a tackle and spreads the ball to a ball playing defender on the right or left of him to start a counter attack.
The wingback will have the wider deeper areas covered - leaving the likes of Rashford, Martial, Lukaku and Greenwood purely playing on the left or right channel waiting for that counter attacking ball to come their way.
Just as much the shadow CDM playing as a CB in the defensive line helps the back 2 have a destroyer playing in front of them (making a back 3) - the front 2 will also have a false 9 that interlink the front 2 together (the reason Lingard is important to Ole).
What this allows is a defensive line of a back 5 when we don't have the ball and an attacking line of a front 5 when we do.
Ole has been playing around with 2 strikers and 3 defenders during matches, playing with false nines in attack and guarders in defence (though we saw this with Jose more when matic & mctomminay played as CB); so I wouldn't be all surprised if he did something like this.