I think you need a CMOS
I think you need a CMOS inverter. Either a 74HC04 or (apparently) 74AC04. I think the clock is the biggest problem right now.
Try the CD4009. It can’t hurt to try. Maybe it will work.
If not, can you order from Newark, Digikey, Mouser, Jameco, Farnell, – or even ebay (from HK, Taiwan, China, etc)? Check octopart.com for additional suppliers; search for 74AC04 and 74HC04.