Interesting, so I hadn't looked too closely at the earlier wiring diagrams I posted above since I was working on a 96 model, but I can see from the diagrams the clutch switch was added for Jan 1995 models onwards. Presumably cruise control was only offered on auto models prior to that year date, but from then on they wanted to at least make it technically possible as an option for manual vehicle models too. What that means for you on a 93 model is you probably have to make a wiring tweak. To test things, disconnect pin 2 from the cruise control ECU. Check the wiring diagrams in my earlier posts to help identify the right one. If everything else is right, that should get your cruise control working (above the cutoff 40km/h). Just be aware it won't disengage if you depress the clutch, so it'll quickly surge your RPMs past the redline if your speed drops while the clutch is depressed.
If it all checks out and you want to add the clutch switch, you'll have to get a switch first of course, for which I'd go with the Toyota 88280-14030 from a later model. This will screw on no worries to your vehicle. Then it's just a matter of routing the wire that goes to pin 2 of the cruise control ECU through that switch. You can get the pigtail for that switch (and probably the switch itself easily enough) from all kinds of vehicles, a pre-2015 RAV4 looking like the easiest source to me, but you could also hit up a 100 series Landcruiser, a Camry from around 2002-2012, lots of sources out there. Any local self-service wrecker should have what you need for a few bucks.