Per my post above, I've successfully pumped grey water into the black tank.
Your idea of emptying the grey into a bucket and then dumping it into the toilet would work.
I don't think there would be enough pressure to connect the grey tank directly to the black flush inlet.
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2002 Montana 3250RL upgraded a bunch
2005 Ford F-250 6.0 Bullet Proofed - SOLD
2017 Ford F350 6.7 Lariet
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