If the loss of sensitivity is caused by your all-day-stretch device, then it might be related to decreased circulation or nerve damage. I’d say that creams won’t help in that situation. You need to pull your foreskin back over the glans and reduce the time or stop using your stretcher for a while and let things heal.
I stopped to wear the stretch device since March 2004. I recovered some sensibility on my glans but not the same I had before I use the device.
Maybe if I use a penis head enlarger with my penis pump. I can stimulate the damaged nerves.