The idea of passing a board acrossed the top of the
cutter head of a planer to face join one face before
planing the other face parallel has been around for
a while and the combination is available on several
currently available machines - and at a size and
with jointer tables long enough to handle furniture
sized stock. Felder/Hammer, Robland, Rojek, Mini
Max and others all have such units, all with 3+ HP
TEFC motors. The combination will let you flatten
one face, regardless of whether it's bowed, cupped
or TWISTED.

Your description of your idea begs several questions
1. can it do the job on a TWISTED piece of stock?
2. what's the max depth of cut per pass?
3. what feed rate at maximum depth of cut?
4. will it work on green or resinous wood
without gumming up?
5. what is the functional life expectancy of the medium
used to remove the wood?
6. what is the cost of replacement of whatever
it is that removes the wood?
7. How thin can the stock be goiing into the unit?
8. will it produce a straight, flat edge that is
square to one flat face?
9. can the planer set up be kept when going
back to joining one face?
10. joining and planing generate a great deal
of "waste" - can they effectively be removed
with a dust collector?
11. how complicated/complex is the set up?

charlie b