I agree that something has to be done and if its not official it will be house-ruled.
personally I can take that only some weapons can be used to for parrying. The problem is that dodging is kind of broken. This will force everyone with a non-parrying weapon to have a shield.
A classic knife-fight in a dark ally require that both of the combatants have the Steady Feet talent or the combat will be decided by initiative.
For example: A and B both have knives. A attacks B. Be dodges (he can't parry because knife is not a parrying weapon), but since he doesn't have Steady Feet Level 2, he end up prone. B has one action left, he can stand up and then end turn but if he does that A can simply attack again and if B dodges that will make him prone again. Next turn. B could feint (no skill required, yet) of course and swap initiative. He will still be prone but at least he has better initiative. So if he do that, on the next turn B stands up and then attacks. A can of course dodge this and if he do, he will end up prone. He can of course as his second action, stand up or feint ...
This feels more like comedy than an epic knife-fight between two rouges in a dark ally.
To keep things simple. You could allow anyone to dodge and stay standing up by instead have a penalty to the dodge (for example -2). You can still do the throw yourself to the ground dodge if you like and then suffer no penalty. The same penalty could be used to parrying weapons. Let people parry with any weapon, but if the weapon doesn't have the Parrying trait, then you have a -2 penalty. I have not tested this, but at least on paper it would give those with the right talents and/or weapons a bonus for that but also give the two rogues for some epic knife-fighting in that dark ally. The reason I have a penalty in my suggestion and not a bonus to parrying weapon is to have the same principle for all defenses and also not to make defensive actions better than they already are.
We have had two test sessions so far. We have mostly done combats (to test out the system) and both me and my players noticed that, dodge is really not a valid defence action (unless you have taken the Steady Feet talent to level 2) it is more of a panic action while you are crying for your friends to come and help you. One example from my sessions is that I threw in some orcs (using the standard stats from the bestiary) and I noticed that they where armed with scimitars and nothing else. This means that they can't defend themselves other than dodge and ... well, if you start doing that you have basically already lost the fight. In the second session I wanted to test the advanced combat system so I had to add shield to the orcs, so they could defend themselves (otherwise the combat would be over almost before it started)
Edit:
Idea 1: Simply remove the fact that you are prone when you dodge and change Steady Feet Level 2 to something else. For example that you can enter rough combat zones without a Move skill check.
Idea 2: Give dodging characters a choice, -2 to dodge if they want to stand up or no penalty and they are prone. Here the talent doesn't need to change.
Idea 3: Allow any weapon to be used for parrying. Give weapons without parrying trait a -2 penalty if using them for parrying. Since I don't like to make parrying better than it already is, a penalty is better than to give weapons with the parrying trait more bonus.
Personally the easiest change would be idea 1. This method is very simple and since I am ok that you can't use all weapons for parrying, I would go for this since then all characters have a valid defense option, dodge (two if they have a parrying weapon or a shield). Sure it can be combined with idea 3.
I had originally suggested the -2 penalty to Dodge, and a variation of it is already in my own hack. Your suggestion to follow suit with Parry is brilliant. That fixes it for me. Obviously talents need a little tweaking, but that's not a problem for me.
Now back to the debate about which weapons should have that Parrying trait!
Regardless of realism, for balance in game, I believe it should only be lighter weapons, staffs and shields.
I make YZE games (https://drivethrurpg.com/browse.php?author=Matt%20Kay) and produce predominately Free League content on my YouTube channel (https://youtube.com/@3skulls)