However, on a "prosumer" level, you can try VoIP/SIP. We transferred our land line to a NY based company who reserve the number for roughly $7/month + $0.02/minute.
Using a VoIP-ATA bridge (about $50 one-time), we've plugged our regular cordless home phone system into the line, so at the home it's no different than our old land line.
Then, we set up a VoIP/SIP connection on both our cell phones, so they also ring when the home line is called. (Note: answering a VoIP/SIP call on your cell phone uses data or wifi instead of minutes.)
And finally, we have specific people who call the general number hoping to reach one of us, so we've routed inbound calls from those specific people to our cell phones. (Note: answering these calls uses cell minutes instead of data.)
This is a fairly popular approach for what you're asking. I know some people who have data-only plans (tablet plans) from competitors and do all their calls through VoIP/SIP. It helps to have a technical background - or friend - for connecting all the parts and pieces, but the final setup "just works".
Caveats: VoIP/SIP doesn't to texting. VoIP/SIP-over-data will increase battery consumption - although some paid SIP apps are better than others. Calls are locked to the device that answers, so you can't join a call-in-progress using the other cell phone.
The short answer is that Koodo does not have such a solution for you. You could daisy-chain a solution by combining cellular with voip, or go to Rogers on a business account and get Rogers Unison (which will be more expensive).
You could port your husband's number to Voip.MS or Ring Central (which wouldn't be a bad idea assuming he doesn't have a big tab balance with Koodo). Then, your husband can get a new number with Koodo. Then you can have dialing prompts on Voip.MS or Ring Central so ppl can press one for your husband and two for you (or vice-versa).
Hope that helps.