Yes, this is certainly feasible. Some women experience a drop in supply if they rely too much on pumping. At 4.5 months your supply should be well-established, but using a lot of bottles could make it a bit more work to compensate for a growth spurt, for example. But when you need a break, this can be a good solution.
I found that changing positions helped - the "rugby" position, for example, helped control too much looking around. Teething may also be a possibility - it can cause sore nipples because it affects the latch, but resolves in a few days after the tooth breaks through because baby learns to compensate.
My best advice is to use lots of Lansinoh and watch for the "golden moment" when he's no longer hungry, and pop him off before he starts the squirming. He is not likely to bite or look around much if he's really hungry - he's likely done by the time he starts it.
Hope this helps!
