Pull the smartcard out, those channels that are left you will continure to get after you cancel.
The FTV (Free To View) channels ITV1, CH4 and Five should continue to work on an ex-subscription smartcard but I have read posts that claim after cancelling even some former subscribers have lost those, bit sceptical of that but I haven't tried it myself so can't dissmiss theirs claims off hand
As for Freeview, is there a local retailer that will give a no questions asked full refund on a STB or don't you know anyone that can lend you their STB to try out?
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