As Rob said just because its called O27 doesn't mean thats the only radius it goes up to 72" radius if you look it can be found. if you really want to change track system look at gargaves it goes up to 138" radius so how about a 11 1/2 foot circle :) you can also combine them as they make adaptors to do so.
Life's hard, even harder if your stupid John Wayne
http://rtssite.shutterfly.com/
In particular, there's Marx O34, which has the O27 profile but a radius of 15.75 inches instead of 12.5, just a little more than the 14.142 inches of Lionel O31; so anything that needs O31 should run on O34. Of course, Marx hasn't been made for a long time; but it's really not hard to find in good condition.
Marx O34 turnouts are also available.
Bob Nelson
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