Is the 27x8.5R14 BFG All Terrain T/A KO still on your short list to replace the 225/70R14? Overall tire diameter is similar (difference is less than 3%). One disadvantage is the lower 95 load rating (vs. stock 98). Also, as previously discussed, they can be noisy when gravel gets in the treads. But tons of tread depth....not many tires out there that have 16/32 inch when new.
I personally don't think that there are any year round tires that are really good in winter conditions. It's a give and take on both ends. If you want really good tires for snow and ice conditions...then you need true winter tires. However, running true winter tires year round, you will notice a lot of treadwear.....ie. the tires won't last very long due to it's soft rubber which is need for traction in winter conditions. IMO, the BFG are not that great in winter due to it's lack of sipes and hardness of the rubber compound. Not sure how BFG got it's severe snow rating on the All Terrain T/A KO's.
Would buying a set of true winter tires and then running them year round be an option? This may make sense if you don't do a lot of mileage and if these tires are on the cheaper side. With a H-rated winter tire, you will give up some snow and ice performance at the expense of longer tire wear (vs. a Q-rated winter tire). Heard at this forum that some Vancouverites use Hankook Ice Bears W300 (H-rated) year round.
Dave