Refreshing the old vinyls

[Reverend]

I have my annual restoration on process (here winters are LOOONG and DARK, so might as well dismantle the car and do something about it) and i wonder could i "revive" those old vinyls somehow? Especially ones over the wheel arch, i'd love to soundproof the area but those vinyls are so stiff and dry that i fear i would destroy them when trying to remove. If there is some safe way to remove them, is there any way to make them nice and soft again? (im not buying repros)

[240260280z]

http://www.classiczcars.com/forums/interior-s30/14673-diamond-vinyl-cleaning.html