The main objection was "we can't transport them". A boat fixes this.
The secondary objection was that Noburi can't keep a large group of unconscious people alive for more than ~3 weeks, and waking them occasionally risks escape attempts or attacks.
My proposal is that we only keep Genin(and chunin?) as long-term long-term prisoners, and carefully wake each one for a short time each day, under close guard from Noburi+Mari+Yuno+Kagome. With almost no chakra, FSB handcuffs preventing Jutsu, movement, and punching, explosive seals stuck to their back, and facing two Jonin, this should be safe enough.