Your biggest challenge is to have overlapping bloom times - if you don't have that then they can't help each other. There are several threads that discuss bloom times for various viburnums ("Viburnum dentatum & friends" is one), you might want to look at those. Here is another one specifically about V. dentatum and cultivars.

The other issue you could have is compatibility. While I do believe that many of the native viburnums are compatible for cross pollination (V. dentatum and V. nudum are the two native ones you mention), it is possible that they are not compatible with your non-native ones (the other four that you mention) even if you do have overlapping bloom times.

Hope that helps.

Here is a link that might be useful: V. dentatum & friends

Viburnum 'Brandywine' easily cross pollinates with Viburnum 'Winterthur' as both are cultivars of the species V. nudum and both flower at the same time. Both are generally considered as a 'sub-species' of the V. nudum which is native to south-eastern U.S..both are hardy and do well in zone 5. Terrific and beautiful coral pink fruit which may also darken to a metallic blue in our experience.

Thank you esh and pop for sharing your knowledge. I now have:

V. Winterthur for the V. Brandywine,
V. Alleghany for the V. lantana 'Mohican'
V. Chicago lustre and V. Northern Burgundy for the V. Blue Muffin
Now it is wait and see. They are all going to be planted in a mixed shrub border. I'm working on the new plants today and will wait untill my V. Blue Muffin and V. lantana 'Mohican' go into dormancy before I transplant them.
Thanks again
Ally

I love a mixed shrub border. I'll cross my fingers for you that your matches bear fruit!