(26 Apr 2020, 6:41 pm)col87 wrote A few more suggestions.
X67 Sunderland Interchange - Washington - Metro centre.
X13 Sunderland Interchange - Seaham - Dalton Park - Easington - A19 - Billingham- Middlesbrough.
X70 Darlington - Newton Aycliffe- Shildon - Bishop Auckland - Crook - Chester Le Street - Gateshead - Newcastle
X8. Hartlepool - Hart Station - Hordon - Easington Village - Dalton Park - Seaham.
Where do I start 
There’s no demand from Sunderland to Metrocentre, we’re not in the 80’s no more
The original 723 route was carved up between Arriva and gne , Arriva got the Durham to Darlington and gne got the Durham to Newcastle section, so there’s no way gne going go back on there word
There be no demand for a direct service from your x8 suggestion
There’s no point in the x13, as you got the X6/x7 from Sunderland and change onto x9/x10 .
Gne are not going to enter Arriva territory and vice versa, as it won’t be good for profits for their shareholders.
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