All the others are right. A month and a half without food is nothing for a healthy BP.
And like mentioned above, no food = no poop. Nothing to worry about. No need for a soak. It'll have no benefit and will likely stress the snake. (Unless there is reason to believe there is constipation, usually identified by "sausage butt").
Also no need for a vet visit if the lack of eating and pooping is your only concern.
Lastly, I agree that small rats are plenty for almost all male BPs, so switching to smalls is fine fir am adult male BP.
At this point, I would just make sure husbandry is on point and only offer every 10-14 days (small rat) until he breaks his food strike.
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