TL;DR thank you @kmarty. thanks to you iv finally got my shared ‘cloud9’ mounted on OS X - it is not yet writeable in spite of force,rw option - would you have an idea on how to make this so?
continuing how-to,
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in this case HFS+ is needed to be able to quickly grab the drive and use it directly off-site (saving native filesystems reminder).
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TL;DR disabling mountd (legacy) solved mac mounting of HFS+ share.
mountd was somehow interfering with accessing sda2 and this thread here solved this Vfat partition always mounts. -
As pointed out by @kmarty, available online OpenWRT tutorials on this subject are at least partly outdated and easier SMB is to be used as Apple standard.
One tutorial specifically addresses mounting HFS+ shares as writeable Mount read-write HFS+ drive in OpenWRT but the given solutions (force,rw option & hfsfsck,kmod-fs-hfs, kmod-fs-hfsplus, mkhfs, and sshfs packages install) arent solving this in my case yet.