If your goal is just to get the "warmth" from analog tape, you could try doing what many music producers do.
Record the session (dialog, in your case) to digital, and use those for post. For the final mix, bounce the entire dialog mix to analog tap…
Most of the major LA and NY post houses are now set up to only handle non-linear DVD-RAM or DAT sound for dailies. Even DAT is beginning to fade out. However, the biggest companies usually still have at least one Nagra T playback deck in-house, so I…