It shouldn't be a problem so long as you create the 'fall' but check that when it's boxed in, your pedestal will move back far enough to fit under the basin.
That's if you will have a pedestal of course. A vanity unit set would solve the problem and hide all the pipe work
Don't use an access bend inside - why would you open a blocked pipe full of sh*t inside the bathroom!?
OP - I can't see that you're going to be able to create a fall unless the stack connection is significantly lower than the pan spigot you're planning to connect to it.
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