Can I still abolish a rule when I've got nothing new to spread?

After much dickin' around in Triple Triad I have spread Open to every single region in the world, and with one exception, that is the only rule existing anywhere.

Galbadia still has the Same rule, but that is it. I understand it's not represented by the CC Group on disc 4 anyway so in the long run it's no big deal, but is it possible that repeated challenges will eventually abolish a rule anyway even though I've no means of triggering a rule mix?

I just need a bit of a definite yes it will work/no it won't before I start actually trying.

From Oswauld's guide on gamefaqs:

Quote:

---

To abolish rules:

Area A: Has unwanted rule.
Area B: Has at least 1 rule, preferably exactly 1 rule, Area A doesn't have, and doesn't have the unwanted rule.

Play a game in Area B. Proceed to Area A and save somewhere near any card
player. Challenge any person to a game of cards, when asked if you want to play
with a combination of both area's rules accept. When given the option to play
or quit a second time, quit. If the rule you want to abolish doesn't get
abolished reset and start over, if another rule spreads reset and start over, if
nothing happens challenge again.
Note: It's best to abolish rules before spreading rules.

---