Busspass,
Don't feel too bummed out. It doesn't require a huge boat to catch them. Only enough boat to feel safe on the water you want to fish. If a lake has enough protection from the wind to keep you from being blown clear across it, an inexpensive little pontoon boat or something would suffice. I have caught plenty of kokanee from a 15ft canoe. You'll want to be able to reach areas in the lake where there there is adequate depth for kokanee. This may only be 20ft at times but it more often much deeper. I'm not familiar with the lake you want to fish but most fishing for kokanee from the shore on most lakes would be near to impossible most of the time. The biggest exception to this is near spawning season when they come up in the rivers. Most waters will close at some time when these fish come in but usually you'll have a small window when there will be some fresh fish that come up earlier than the rest. You'll have to check the regulations to see what is legal and where in order to do this and still abide by the law.
One other option is to find someone, a neighbor, a friend, a coworker or someone else that wouldn't mind having you ride along on a trip or two in their boat. Most boat owners are fine with guests who are respectful and especially those who are willing to pitch in a few dollars for gas. Good luck to you however you choose to go about it. I hope you find a way of getting to the fish, they are a lot of fun and are delicious table fare.