Wow, I totally missed seeing the notification for this. Looks like it came to my spam folder.
I’ve seen people go either way on blessed vs. blest. The classic poets wrote bless’d, but that may look odd. I personally prefer to just use “blessed” and let people figure out which pronunciation to use based on the way the tune’s rhythm goes.
I like the poem. I think it works and will be successful when paired with a tune. Although I could wish that the second rhyming pair in st. 3 worked better.