Data Centre site affinity and persistency

That inspire me somehow, I also have a similar scenario but not sure if it is the same as you described here. I have a situation where client has to stick to the same backend node no matter what IP the GTM returns. The setup has a GTM WIDEIP which has one pool and a GTM pool round robin 2 members VIP -e.g LTM in locationA (10.2.0.1:443) and another LTM in LocationB(10.4.0.1:443). Both sites have a VIP setup -e.g LocationA -10.2.0.1:443, LocationB - 10.4.0.1:443 and pool set up with 2 members -e.g. 10.0.0.1, 10.1.0.1. The client doesn't cache cookie. We tried to use src IP address affinity but it doesn't quite achieve 100% stickiness. Will oneconnect plus src IP persistence work ?