There are not going to be any rules for that. This is an area that is just a GM call if they wish to allow custom magic items at all.
Personally, I have never seen anyone without weapon training buy these items, and they are a very frequent buy for anyone character that has weapon training, so I would place the bulk of the value of these gloves on the weapon training portion. Based on that, I would at a gut calls say 2/3 of the value is weapon training, so 5,000 gp.
One can also look for similar items that do what you want, but I don't know any right off the top of my head that are similar. Closest I can think of is gauntlets of the skilled maneuver, which gives a +2 bonus on any one combat maneuver for 4,000 gp. A bonus on a maneuver is of course more valuable than a bonus on defense against a maneuver, but your glove would provide twice that bonus against 2 maneuvers, plus the grease defense. If we follow the 'bonus squared' precedent for armor and weapons as the pricing for these gloves, and assume that line weapons and armor, the base price for offense is twice as much as defense, we would get a formula for the Gauntlets of skilled maneuver bonus being X * (2*2) which mean X is 1000 gp. That would make the formula for a defensive maneuver item 500 gp X bonus squared, so a single bonus of +4 would come to 8000 gp, which is obviously too high based on the price of the Gloves of Dueling. If we decide that defense against a combat maneuver is situational as well as being defensive (unlike AC which applies to most attacks) and half the base price again, we would get 4000 gp for an item that adds +4 against a single maneuver, which still seems high to me, but possible reasonable. Calling a second maneuver a similar ability and thus adding it for 75% would make it 7000, and call the grease defense add on worth 1000 gp gives us a value of 8000 gp for the item you describe, which I think is definitely a pretty good 'high side' value.
All that said though, this is 100% up to your GM. The above is just an illustration of some of the things I would think about personally when trying to determine a price. And there may well be better examples out their of items to compare this too.
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There are not going to be any rules for that. This is an area that is just a GM call if they wish to allow custom magic items at all.
Personally, I have never seen anyone without weapon training buy these items, and they are a very frequent buy for anyone character that has weapon training, so I would place the bulk of the value of these gloves on the weapon training portion. Based on that, I would at a gut calls say 2/3 of the value is weapon training, so 5,000 gp.
One can also look for similar items that do what you want, but I don't know any right off the top of my head that are similar. Closest I can think of is gauntlets of the skilled maneuver, which gives a +2 bonus on any one combat maneuver for 4,000 gp. A bonus on a maneuver is of course more valuable than a bonus on defense against a maneuver, but your glove would provide twice that bonus against 2 maneuvers, plus the grease defense. If we follow the 'bonus squared' precedent for armor and weapons as the pricing for these gloves, and assume that line weapons and armor, the base price for offense is twice as much as defense, we would get a formula for the Gauntlets of skilled maneuver bonus being X * (2*2) which mean X is 1000 gp. That would make the formula for a defensive maneuver item 500 gp X bonus squared, so a single bonus of +4 would come to 8000 gp, which is obviously too high based on the price of the Gloves of Dueling. If we decide that defense against a combat maneuver is situational as well as being defensive (unlike AC which applies to most attacks) and half the base price again, we would get 4000 gp for an item that adds +4 against a single maneuver, which still seems high to me, but possible reasonable. Calling a second maneuver a similar ability and thus adding it for 75% would make it 7000, and call the grease defense add on worth 1000 gp gives us a value of 8000 gp for the item you describe, which I think is definitely a pretty good 'high side' value.
All that said though, this is 100% up to your GM. The above is...
Thanks exactly what I was looking for.