Whether hotwire, or trap door, or karmen vortex, they are all airflow meters.
They all measure airflow, afterall.
An alternative to buying an adaptor, is just cutting the airflow meter housing out of the airbox, and stick a pod filter on the end.
However if they're wanting any sort of warranty or garauntee on your work, then I'd not reccomend fitting a pod filter, or at the least, warning them that it may make the car run poorly, and based on my dyno comparisons, doesnt give any extra power.