I am fairly new, so Caveat emptor. Like Bob said, I can't find anything either that works in FLDIGI.
FWIW, I extract my PSK contacts from ACLog (or could use FLDIGI log extract). Then I grab the latest PODXS membership list. Then I do some merging & comparing (chanting and incense as well sometimes) of PODXS membership dates and QSO dates in excel to identify those contacts I think will help me on my way to LONP. It is pretty manual, but I don't do it often so it isn't to big of a pain.
Once I have identified those contacts, I just leave them in excel for now - I could go back to ACLOG and manually update the entries with the PODXS numbers, but I am too lazy.
I have always wondered how folks keep track of PODXS # in Ham Radio Deluxe. I like to use the Automatic Log Entry (ALE) for PSK so the only field available to use is the Comments field. The PODXS # automatically shows up if I've worked the station once I click on the call sign. If the station is a new # for me, the comment field is empty. I know I can create a special field to enter PODXS # in my Log Book but that field won't show up in the AEL. I've also been using the Comment field in the ALE to enter Contest Exchanges. I know there better contest logging programs out there but haven't invested the time or money to explore better options. If I did uses another contest logging program it would have to run parallel with HRD. Where HRD falls short is reporting dupes before I log the station. ___