1" will work. That puts the center line of the scope 25.4mm above the rail. My egw hd base is .385 or ~9.7mm. That would give 35mm total rise. You only need 28mm or so. This of course does not account for the fact that the barrel tapers down and that it is usually smaller than the receiver, this providing even more clearance.
Not sure what you mean by a standard egw base, but if you mean a non moa base with no added rise(essentially a flat plate), it will still work so long as it's at least 3mm tall, which it will be.
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