That’s plenty of chilling. Unlike my apples the Bosc and Comice pears never seems to show any effect from the very low chilling we’ve had recently. Mine took 7-8 yrs to first bloom. It might bloom earlier in a pot but man I just don’t see that being a good combination. The tree may almost quit growing entirely before it blooms. It can only get so big in a pot.
I’d try something else or sell the pot. I’ve been thru the pot thing with many fruits and it hardly seems worth the effort.