How to use tuareg-menhir instead of tuareg-mode?

[fdagnat]

Hello

I prefer to use tuareg-menhir for my mly files. Right now, I must manually patch the opam-user-setup.el file to replace

  (add-to-list 'auto-mode-alist '("\\.ml[ilyp]?\\'" . tuareg-mode))

by

  (add-to-list 'auto-mode-alist '("\\.ml[ilp]?\\'" . tuareg-mode))
  (add-to-list 'auto-mode-alist '("\\.mly\\'" . tuareg-menhir))

The problem, is that I loose the (potential) updates later on because opam-user-update detect the manual modification and refuse to modify this part...

Is there a way to keep the best of both worlds?

Thank you