I have used a swimming pool hose to start a syphon and back-flow the plumbing in question - with great results.
Remove the filter or replicate whatever the situation was when the piece was sucked in, and then apply the suction of the syphon right at that spot. I have gotten sticks from N2 cartridges, underwear, bathing suits, washcloths, and even one very small rubber ducky out this way, and didn't need to even so much as open the equipment compartment door.
HTH