Initiator failover funtion

Hi,
I just learn the QuickFIXJ, and thinking if QuickFIXJ could support the below failover/ HA scenario, or if you could give me some suggestion for the custom dev?
We act as Initiator to connect to the external acceptor, as the Initiator, we want to deploy to two servers, one as the primary which is active, the other is the backup, and non-active.
Primary will be communicating with external acceptor, meanwhile, by HA module, the secondary sync with the primary at the seq number, msg, etc.. Once primary is down, secondary will take over the primary role, and connect to the external.
Checked the document, seems QuickFIX support the acceptor failover, but dont have the initiator case?
could you help let me know how address this? thanks.

by the way, i also developing to send the FIX msg to IBM MQ, could you suggest if QuickFIXJ has the persistence module/ api to store the un-delivery msg if MQ down, and then send out once MQ is up?