There should be no problems with it working in 32bit fb2k v2.

However, performance may take a hit and anything depending on the existence of foo_playcount / displaying ratings via script will probably be broken.

foo_playcount is obsolete in v2 and playback statistics are built in. So if you had clickable ratings that write file tags if foo_playcount is missing, that would always happen because the condition would always be false. But %rating% would not display content from file tags because playback statistics takes it over. You have to use %rating% for playback statistics and $meta(rating) for file tags. This applies to everyone who may not have a clue what foo_playcount did previously as it's now global whether you like it or not.

And yes, I have the files named as your example as well as track metadata stored with dBpoweramp (a blessing of a software, no doubt)