If you just want to secure yours for now, you could remove the 4 headboard screws and pull the headboard away from the wall, then apply new industrial strength velcro and put it back in place. If your old fabric is not gripping the velcro, add a couple of staples through the velcro.
And, if your headboard screws are like mine were, they are not holding anymore, so make new holes when you put them back in.
PS, that alpine 36 wall looks cool!
2000 Alpine Coach 36 FDS