Of course you can label tapes with another software. However, all software i have seen so far is only able to accept its own labels.
The other issue is that if you label tapes by another NW system, the intended one will not 'know' the media until you will scan or relabel it there. Consequently, your work might be good as a service but it will not really help your customer.
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I just googled for IBM 3592 tapes an i verified that these are also available as WORM (Write Once, Read Many times) tapes. Could the problem just be that you try to rewrite these tapes? - such of course would not be possible.