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I thought all flame traps were removable from the housing, I have never heard of non-removable ones before. Granted some may be difficult to remove due to age, gunk etc but they are supposed to be removable.
Not sure which you mean by the outflow tube, but I don't remember there being a restriction anywhere, just that the vacuum feed is a small diameter. The vacuum is regulated by the metering orifice (the brass fitting that screws into the manifold) os enlarging the hole in the flame trap housing will not make much difference. Reaming out the metering orifice in the manifold is going to introduce more unmetered 'air' thus leaning out the mixture slightly, not something to be recommended.
If you blew the crank seal I would guess that other parts of the PCV are still blocked eg metering orifice, hoses or oil trap. Do you pass the jiggle test?
If the blowby is enough to overwhelm a functioning PCV system then I would guess that the engine would not be running very well and burning a lot of oil. It should always be easier for blowby to escape via oil trap, flame trap and hose to intake than to blow out a seal so check the rest of your PCV system.
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