If it was just the TelePresence bit, I'd had a chance of answering your question/ For the full Jabber / UC experience, my company hasn't gone down that path yet. We haven't yet deployed anything on the 6k hardware yet either, so I can't help much with those part numbers.
Though not the ideal solution you can use Jabber Video the free service hosted by Cisco to dial into H.323 and SIP systems from PC/Mac. See the following link: https://www.ciscojabbervideo.com/homeIt works well if you have got sufficient bandwidth. Problem is you won't have much control since everything is managed on the Cisco cloud ie not managed from your onsite servers.
Yes R-CBE6K-K9 is the top level part number which you can use to configure BE6K. Use the following ordering guide: