Todd,
Love your stuff.

I always wanted to see a fitting that uses bleed air from the turbine to
fill/keep full the retract system.

It would probably need a ball-check type valve coming from the turbine side
and a pressure release to prevent over pressuring on the retract side.

To avoid many of the temp issues, I am guessing we could drill & tap into the diffuser just past
the compressor.

I'll give you a week or two and start checking my mailbox.