Displaying the same album across multiple box sets

[simbun]

I was never comfortable with having to rename the folders in order to separate the albums, so I ended up creating a new tag in foobar called UNIQID composed of $crc32(%album artist%$if($meta_test(boxtitle),%boxtitle%%album%,%album%%release%)%date%) which I then use in MinimServer as:

aliasTags: Album:inAlbum,UNIQID:Album
itemTags: inAlbum
tagFormat:Album.displayFormat={$inAlbum^^^$boxtitle^ (from the boxset ^)^$release^ (^)^}

However, what I'd really like if is the tagFormat took the first non null value from $boxtitle and $release so I could create something like:

Sgt. Pepper's Lonely Hearts Club Band (from the box set The Beatles)
Sgt. Pepper's Lonely Hearts Club Band (from the box set The Beatles In Mono)
Sgt. Pepper's Lonely Hearts Club Band (Super Deluxe Edition)

Is this possible?