I've just talked to R&D and there's actually a way to prevent this, at least partially. By default, Veeam B&R performs tape devices rescan each 30 seconds, which makes it temporarily (for the duration of the rescan operation) lock the device. You can increase the rescan interval by setting it to extremely high value so that rescan never occur after Veeam B&R is started (so basically rescan will be performed on each Veeam B&R service start only, allowing you to successfully use BE the rest of the time).
The interval can be set via the following registry key (value in seconds):
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