Yep, you'd need to get rid of you route statements above, then use an acl, something like:
conf t
ip access-list extended FUBAR
permit ip host 10.0.1.5 192.168.1.0 0.0.0.255
permit ip host 10.0.1.6 192.168.1.0 0.0.0.255
deny ip 10.0.1.0 0.0.0.255 192.168.1.0 0.0.0.255
then apply this...
The other two switches will keep working amongst themselves. Assuming you have spanning tree running (the default), then it will do a short reconfig when you disconnect and connect, but it should not interrupt traffic, unless it is very heavy.
What I've done is specify a NTP server on the other side "ntp server x.x.x.x", which halfway regularly sends ntp traffic over that link. There might be a way to do this with keepalives too. Another way might be a TCL script that sends pings. While I'm at it, you could enable CDP over it, that...
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