Hi chs4000,
If you are only looking for better temperature regulation then even a very thin wool/cotton mattress protector such as the St Dormier (see post #89 here) or different sheets such as cotton, viscose, or better yet linen (see post #7 here) may be “enough” to keep you in a comfortable temperature range.
If you do decide to go with a wool mattress pad or topper I would probably stick to thinner versions so that it will have less effect on the softness and “feel” of the latex underneath it. Even thin layers of wool (in the range of 1/2" or less) can have a significant effect on temperature regulation but thicker layers can “firm up” any soft latex underneath it, especially when the wool compresses.
I would also consider sleeping on the latex topper with your mattress protector and sheets over it to see how it does with sleeping temperature before you consider the other options you have.
Phoenix