On Saturday, June 27, 2020 at 4:28:57 AM UTC-7, wrote:
A controller can't approve such a request without sticking their neck way out.

Get in touch with the facility (Seattle Center?) and work out a window. You can use other LOAs to make a draft. Window should be clear of both low- and high-altitude airways if possible.

He would need to contact the Spokane FSDO.

Tom