Gigi, please ignore the impolite remark above. I think your question is completely appropriate for this thread. I have made a thorough search online and Dunlop appears to be the only manufacturer of clear fingerpicks. And as you pointed out, they only make them in medium or large.

I have two suggestions:

Contact Dunlop and explain your plight. Perhaps there is something they might do. After all, you are certainly not alone in your need.

Or, purchase some of their medium fingerpicks and modify them. This may require a bit of sanding and a quick (20 seconds for a start) dip in boiling water. Although the latter would work best if you were actually wearing the pick at the time, I don't suggest it.

The sanding would be for the purpose of diminishing the circumference of the pick. You might find that a small nail file or coarse emery board may suit the purpose. Once you have accomplished this, it is time for the pick to have the hot bath mentioned above. Immediately upon removal of the pick from the water, form it to your finger. You'll be surprised to find that the fingerpick is not nearly as hot as you might expect; but it should have become somewhat pliable. If it isn't, increase the dip time a little. I believe you will find more detailed instructions elsewhere in this thread.

As I write this, it occurs to me that the boiling process might be more easily accomplished by simply microwaving the pick briefly. I'm not sure I could recommend this without having tried it, but it seems quite possible. It also seems rife with possibilities for error. I'll post results after I give it a few tries.