If you have a submersible pump in a reservoir you could (at least temporarily) put the output from the radiator straight to the reservoir. This way if anything does pop out of it it will be stuck in the reservoir.
Or you could put a small wire mesh filter somwhere behind your radiator, but this might seriously impede your flowrate.
After you're certain that nothing else is going to come out you could arrange the elements any way you wanted.
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