As John has said you can not go past the 7 mm Pentax.
I would recommend the Vixen LVW but it does not have a 7 mm and the 8 mm LVW is a bit close to your 10mm Pentax.
I don’t think and correct me if I’m wrong,
but the Takahashi LE range of eyepieces do not have a threaded bottom barrel.
So you can not screw filters into the bottom barrel.
You may one day find you would like to do this for faint Planetary Nebula.
