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I've cut a new release of uma/phpecc with no instances of gmp_pow() based on this comment, this seems to fix the issue.
To get there this also required to fork fgrosse/phpasn1 and cut a new release for that project as well, also abandoned: fgrosse/PHPASN1@master...1ma:PHPASN1:master
Bottom line PHP Schnorr cryptography is abandoned, unmaintained and borked. Everything should move to libsecp256k1.
Addenda: the new env var can be removed once php-cs-fixer starts supporting PHP 8.4.