Which OTP?

What is wrong with forward facing drop-outs? For a non-track specific fixed gear/ single speed they make a lot of sense. They give perfectly good chain tension adjustability and make it easier to run gears if you want. You can also run full length mud guards and pannier racks with no wheel removal issues.
There are no real issues removing a wheel with rear-facing track ends and full mudguards, I run SKS Chromoplastics on a Tricross and it really isn't a problem (I too was concerned before I actually tried it.) You don't even need excessive clearance.