Followed instructions from
https://www.choicehotels.com/choice-privileges/membership-levels/status-match, received response within an hour. Email to Status_Match@choicehotels.com with subject line "Choice Privileges Status Match".
Email needs to include the following:
Full name
Choice Privileges member number
Proof of Elite status in another hotel program:
Screenshot or copy of your other program's loyalty card (with expiration date)
Or, screenshot or copy of other program's current statement or account status page
European Members | Australian/New Zealand Members
Caribbean / Latin America / Mexico Members