Hi,
Not sure if it would be safe, but quite sure it would be a problem when you want to remove it in the future. I too have this problem with my 'underflow' inlet.
I solved it by getting a piece of plastic netting with holes about 2mm x 2mm. Available from hardware stores. Cut a strip of it, fold it into half and force it into the opening, because the plastic is qutie rigid, there's a tendency for it to unfold itself, hence it is holding in place quite well.
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