ht specific wo ? plans for 10$ ? what's that ? i've never seen it maybe you mean the wo32...that's a whole diffrent story.
people have used re xxx10s(32 mm xmax) and re sx 12 (20mm xmax) in the wo. the ids are puny compared to those. so it's not too much xmax. you can trust win isd (the pro version), but i wouldn't bet on the accuracy. since id reccomends .70 cf for sealed, i guess they will work in the wo.

Xmax that high should not be a problem for HT use.  You run into problems with High XMax woofers in a frontloaded horn with a compression chamber when you expect them to accurately produce all bass.  When you go higher in frequency, the compression chamber will do what it says: compress the wave front.  When transients are expected to be produced, they are lost in the compression and the bass becomes muddy.

But if you are using it for low frequencies, whith transients being played on other speakers (midwoofers) then that xmax will eb fine.

Or if you are using it for higher bass, the really low notes won't be there to muddy the sound.

The WO can be used for everythign too if you want, but with higher Xmax, do not expect incredible accuracy.  So a lower xmax driver would be in order.

In my opinion, that driver isn't to extremem in the Xmax where compression would really be a problem anyways, so it should work fine.

It really only has to do with High Xmax drivers in front loaded horns that use a compression chamber, i.e. the WO.