Defining a subset of library by list

Hi,

I have some external list of book ids and I want to work only on this subset of books in calibre.

It can't be done by any search right now (I mean the list of ids can't be obtained by some simple search query in calibre, it's basically random)
I don't know how to convert the list to search over 'id', but I'm still afraid it won't let me enter the huge search query (we're talking hundreds+ records).

The only thing I came up with is to define some temporary boolean column, externally fill it (sloooooooow), do my work and then remove the column.

Any ideas, please?

Thanks,
J.