Could teamsite7.4 or 7.5 work with DB2 UDM version 10.5
The only versions that are supported are in the compatibility matrix.
https://customers.autonomy.com/support/secure/docs/Documentation/Interwoven/TeamSite/TeamSite/7.5/Guides/pdf/TS_7.5_matrix.pdf
https://customers.autonomy.com/support/secure/docs/Documentation/Interwoven/TeamSite/TeamSite/7.4.1/Guides/pdf/TeamSite_7%204%201_CertMatrix_Rev0_en.pdf
Although, it may work in other versions, only the versions listed in the docs above would be supported.
The short answer is no. 9.5 is the latest supported version.
/t5/Marketing-Optimization-Wiki/TS-Compatibility-Matrix/ta-p/202464