Can't you do what I did and order a Festool 493566 which is a Copying Ring OF 1400 which then allows you to use any standard screw in type 'template guide' ?
Just for clarity, the UK versions of the OF1400 do not come with the US style guide bush adapter, we get a 30mm guide bush instead, and if we want to use US style guide bushes we need to buy an additional Copying Ring OF 1400 (493566).