I totally agree, the "new shooters" argument is simply a bunch of dudes who bought into the red dot carry sales pitch, and they want all the cool stuff of open, but they can't compete in open. They want an open-lite, where you can't use a $3,000 gun, you can only use a $1,500 gun. Which is fine, but let's not act like new shooters at level 1 matches actually care about the differences between classifications.
If you want to get new shooters in to shoot matches, invite them, then when they're at their first level 1 match, waive the fee and let them shoot, who cares what division they're in, it doesn't matter, they shouldn't care, they should only care about the shooting and if they're worried about classifications and gear then you're failing as a range and as a group of shooters. If you get someone new in, let them borrow an extra mag, let them throw it in their pocket, let them use whatever holster etc. If you're so uncomfortable just put them in open, tell them that if they want to continue competing they should buy and extra mag and mag holders. They'll eventually comply with the rules.