I know it's not a trans map, but I use a 3D prop for my renders, it works surprisingly well! I don't own a V4 yet, but I use it on V3 and Jessi and such. It doesn't exactly "fit" all figures but it's easy enough to change the axis scales and rotate it a bit to fit other figures. I find I get best results if I use 2 or 3 different props, scaled slightly differently and slightly varying in colour and shade. It really looks realistic, but doing it this way can be very hungry.

I just had a look for this in the freestuff but had no luck. I've had it a few months, so maybe it's not free anymore. I did however find this in the content paradise, hope this helps:  http://www.contentparadise.com/us/user/v4_pubic_hair_complete_product_26412

If you wanted to try the 3D one I use, as I got this for free, I wonder if it would be wrong of me to send it to you? I don't wanna go breaking laws or making enemies but it's just a thought. PM me if you like.

I'm running Win 10 Pro 32GB RAM Intel Core i7-4790K CPU @ 4.00GHz Nvidia GeForce GTX 1660 Ti

My DA Gallery: glen85.deviantart.com/gallery

Peace, love and polygons!