I gave Communicator 5, Windows Access, and Beam a once over. I see Beam is a bluetooth interface for your phone. It's not what we've called a "tunnel," but that's OK. I can see how it's convenient. That said, I have a couple of questions:
1. I don't see the Android (phone emulator) as a stock feature of C5. Do you know the name of the one you have? Or is it used/installed in/over Windows Access?
2. Is navigating anything via Windows Access terrible or bearable for you? There are several free texting apps/programs I've found. A couple that will use your current phone and number (but requires your phone to be online--kinda defeating the purpose of moving from Beam) and a couple that will give you a free phone number that can text any other SMS device (all cell phones with service). Then there are a ton that require the same app to be installed on any other device you communicate with (least desirable, but if you're only texting with a couple of people it might not be overwhelming).
The simplest texting solution if you have a gmail account is to use Google Hangouts
https://hangouts.google.comfrom Windows Access after you've selected a google voice phone number
https://voice.google.com and enable "Connect Hangouts" in the setting there. It can text/sms with any phone number for free and is web based and there are apps (which may have easier interfaces although the web/browser one is more flexible IMHO). The best part is no installation required and you can access on any device that has a browser and internet connection!
Anyway, no rush on anything. I just wanted to document what I've found and get a couple of answers to questions that have come up to tailoring solutions!