I would try using HSRP between A and D L3 switches , and the host A vlan transported between A and D location on layer 2 link.
The only problem is that you will have the layer 2 link ,a critical one => if the link goes down , there will be some issues between host A and C (for example).
Then the best way , using this setup , will be to advertise the Host A prefix with a cost better from A router,then from the router D, and also the A router being the HSRP active. This way the D router will be used only if A fails.Also to cover all uplink loss of the router A you will have to do some HSRP tracking , based on some interface status , or routes in the routing table , this way if A router will have both uplinks down/ospf adj , it will not be the HSRP active.
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