Voice acting category won't accept more than one dubbing credit per person in a same title

Hi, everyone:

The update form for the new Voice Acting - Dubbing category has a safeguard to prevent duplicates that detects when a person already has an entry in that section for a specific title and language, even within the same contribution. I think this is a great feature, but, similar to the Cast section when some attributes (e.g. voice) apply to some characters played by a same actor and not others, there are certain situations that cannot be resolved satisfactorily.

I just watched Tenkû no shiro Rapyuta (Castle in the Sky) (1986) (simply beautiful, by the way, as we have come to expect from Ghibli). With regard to dubbing credits, I am in the process of doing two things, and in each of them I have found an example of what I mentioned above:

1. Transposing (voice: English version) entries from Cast to Voice Acting section.There are two English-dubbed versions, one from 1987 by (allegedly) Magnum and another from 2003 for Buena Vista (Disney). The current page shows the cast of both dubbed versions. Note that Eddie Frierson worked both on 1987 and 2003 versions, playing different voice characters. In theory, to contribute all the information using the proper fields, I should add two entries, but logically the form prevents me from doing so.  
2. Adding Spanish dub cast.There are two Spanish-dubbed versions, one for the first DVD release in Spain in 2003, and a second one for the DVD re-release in 2010. The latter is also used for the Blu-ray and current streams available on Netflix. One actor, Fernando Hernández, voiced Oyakata in 2003 and the Old Engineer in 2010, while Rafael Azcárraga voiced Oyakata in 2010 and Julio Núñez voiced the Old Engineer in 2003. Again, the system prevents you from adding both entries.  (I didn't enter 2003 DVD as an attribute since it is the first dub in Spanish; 1987 Magnum should be dropped too for the same reason, but I believe it may be of particular historical interest)

Assuming that the system will not be modified so that the pair of fields language/dub version is detected as a duplicate and not just the language field, how do you recommend I enter this information with the current infrastructure?

Thank you!