Is Keyscan Present 3 Compatible With DSC?

I'm wondering if I can take a DSC Power series PC1864 with a TL250 internet communicator and use present 3 from keyscan to arm/disarm the system. Being that the TL250 does NOT use the keybus 8 slot and uses its own connection i believe this is possible. Trying to flip a VERY picky customer from total connect and a Vista 21IP to DLS 5 and the PC1864 from DSC to integrate with their Keyscan system. We have already gone the Alarm.com route and the customer is not happy that they cannot manage user codes while the system is armed. Really would like to know how the DLS 5 software works and experiences you may have had with it in the past. If anyone has any knowledge or useful articles/videos on this any help would be appreciated. Thanks!

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