What about making one from an allen wrench? Been thinking about trying it here lately.
I get my weird tools like that -cheap- at a used tool store. $2 for a blue handled Ecelite #8 torx just happens to have the hole for 'security' screws. If I have trouble with it being too weak I'll file it shorter.
They also have the good old craftsman tools they haven't made for 20 years too and other cool stuff like that. Like for $8.50 a special '1/2' drive, 5/8' impact-knuckle-socket' with Mac stamped on it to reach the upper bolts on my pickup's bell housing. It's cool!
I cut a 5/8' socket as short as I could and that wasn't short enough with an ordinary universal joint attached and the impact universal joint was too big around. My pickup doesn't need much in the way of special tools tho.
Check the yellow pages for 'Tools -used'.
Alvin in AZ