At the very top of my bucket list (been in that position for 15 years) is a trip from Wollaston Lake to Baker Lake via Kasba Lake and the Kazan River.
I made a preliminary map of the route here:
Route from Wollaston Lake to Kasba Lake, Kazan River to Baker Lake
caltopo.com
The map shows all the "portages" from Wollaston to Kasba, the part from Kasba to Baker Lake has camp locations used by previous paddlers plus some markings for the most significant rapids.
It has some details of the route from Wollaston to Kasba. Of all the various options to get to Kasba Lake I think my planned route is the easiest. People who have done the version that starts from Reindeer Lake and accesses Kasba from the east side have pretty much all reported long stretches of "no water" with extensive dragging/portaging. The route of my plan looks to avoid most of that low/no water issue.
I have communicated with a few people who have paddled a few parts of my route, it seems like it would be relatively easy, the upstream portion is mostly lake to lake to the headwaters of the Schwandt River and then all downhill to Kasba.
Are you planning to fly out from Kasba Lake or continue on using the Kazan or Dubawnt? Would this be a solo or "group" trip? The biggest logistics issue for me is how to get to Wolleston Lake without having to return there at the end of the trip (My plan was to fly out from Baker back to Toronto while my boat and gear would go by ocean cargo to Montreal.
If you want to discuss in detail you can send me a PM.