portmaster -o to replace multiple ports with 1 (e.g., xorgproto)?

[jhgit]

Recently a bunch of x11 *proto ports were consolidated with x11/xorgproto. See /usr/ports/MOVED.

Running portmaster -o x11/xorgproto bigreqsproto xproto xextproto xfixesproto (... and so on, enumerating all the installed ports that xorgproto replaces) fails with this kind of problem:

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===> Registering installation for xorgproto-2018.4 as automatic
Installing xorgproto-2018.4...
pkg-static: xorgproto-2018.4 conflicts with xproto-7.0.31 (installs files into the same place). Problematic file: /usr/local/include/X11/DECkeysym.h
*** Error code 70

Stop.
make: stopped in /usr/ports/x11/xorgproto

===>>> A backup package for bigreqsproto-1.1.2 should
be located in /local/usr/ports/packages/portmaster-backup

===>>> Installation of xorgproto-2018.4 (x11/xorgproto) failed
===>>> Aborting update

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Is there currently a way to get portmaster to support a rename from N to 1 port like this? I suspect not. Looking at the current code, I think -o only supports 1:1 port replacing.