Hi csice and welcome to the MattressUnderGround and thank you for becoming a MUGster!
I have not searched to get a custom made Viscoelastic memory foam pillow.
I am pretty particular when it comes to pillows My partial pillow collection. I would say if you want a good quality VE Pillow, stick with Tempurpedic. Their procloud series is excellent. If you like very firm that is not a contour pillow, then their Dual Breeze pillow is for you, otherwise the procloud hi is the next in line for firmness.
I am sure you could try a few of the memory foam outlets on line, but you need to be careful, as some 4 and 5lb memory foams at some of the foam on line sellers use very soft foams.
Unfortunately, Tempurpedic does not allow returns, so you may need to go to one of their showrooms to try one. You can also buy on Amazon, where TP pillows are returnable. The best time to buy on TP website if you have found a model that you like, is on their BOGO free sale, that happens once or twice a month, so sign up for notifications on their website.
Good luck pillow hunting,
Maverick