Of the suggestions mentioned, an accordion would be really handy on occasion, and humming articulations for Vienna Choir would be magical. I'm hesitant to mention solo singers, as a lone human voice is incredibly delicate to edit seamlessly, but the VSL team did such a stellar job with the crossfades on the recorders pack that maybe there's nothing they can't do...
AMD Ryzen 7 3700X 8-Core 3.59Mhz Processor,
64 GB RAM,
Windows 10.0.19045,
Cubase 10.5.20,
Sibelius 7,
VEP 5.4.16181,
VIP 2.4.16399,
Symphonic Cube, MIR Rooms 1-5, Suite, Choir, Organ, Imperial, Solo Voices, Dimension Strings, Historic Winds, World Winds