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It appears to me like the entire branch of ports for LXQt will need to be upgraded together.
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I have not looked LXQt closely but it's predecessor, LXDE was fairly modular and
x11/pcmanfm is available in a ports tree that lacks LXDE.
This would suggest several other options.
1) In LXDE, default applications can be set by running lxsession-default-apps in a terminal.
x11/lxqt/session likely has the same functionality. You can also manually edit ~/.local/share/applications/mimeapps.list
http://xahlee.info/linux/linux_set_default_app.html
2) The pcmanfm-qt port looks fairly simple (just 2 patches) and you may be able to upgrade the port to 14.1 individually.
3) Unless you are invested in Qt5, I put together an LXDE clone in the howto section of the forum. It should still work as is although the menu hack, using xdotools, can be replaced with jgmenu in 6.5. (note: The x11/jgmenu entry is missing in openports.se).
https://www.youtube.com/watch?v=XDmNO_83EnM
4) I've found that the gtk3 version of pcmanfm will remember what the file was opened with. I usually don't like a default of looking at a *.jpg in gimp. If this is the case with pcmanfm-qt, you could easily set your default mimetype.
5) You can mix toolkits and install the gtk version of pcmanfm. By default, the LXQt desktop uses gtk based
x11/openbox. I tried LXQt in Arch Linux, and was able to use kwin in place of openbox. The Qt5 version of kwin does not pull as many dependencies as the Qt4 version. There is an ongoing effort to upgrade KDE4 to Plasma - the build infrastructure is in ports now.