Dial torque gauge substitute?

Given we're a fairly ingenious bunch here, I'm hopeful I might be able to find a work around for a little snag I've hit.

I'm about to undertake a timing belt change on my Landrover Discovery 300tdi engine... But I've got a bit of a problem... Come time to tighten the belt, I need to pull 11nm on the tensioner. Service manual calls for a dial torque gauge, but at 250-500 dollars, it's not a tool I'm racing out to buy.

The common alternative suggestion is an old style, non mechanical deflecting beam torque wrench. The kind with two arms and a scale, where you pull and as the bar your pulling flexes the other stays straight and points to how much torque is being applied. It's a great, cheap alternative except that they're more or less unobtainium these days in Australia thanks to the rise of cheap clicker type torque wrenches. I've asked around the tool shops, family and friends, even a couple of old mechanics I know, but to no avail.

Normally I'd just set a timing belt by feel/eye, but given that Landrover amended the torque required from 15nm to 11nm, it seems like it's fairly critical in this application.

So is there any way J can reliably pull that torque spec and hold it while I tighten the retaining bolt without either of the two above mentioned tools?

I've thought about setting one of my torque wrenches at 11nm doing A couple of test pulls to get a feel for how far/tight it will be and then bumping it up to 12nm and trying to hold it just before it clicks, but not sure I trust that much.

Do y'all have Pawn shops? If so check there. That is where my dial torque wrench came from. IIRC it was $15. 

You might also look for a digital version. They usually give some warning before reaching their set torque which should make it easier to sneak up on it without going over.

Can you use a spring scale? Like they use in shipping. You tug on one end, and when it sets to the 11nm, you tighten the bolt. Perhaps I don't understand the scenario right. But I've used this method to set the drag on brake rotors. 
https://sciencekitstore.com/spring-scales-newton-scales-individual-scale/?sku=PSS_US1&gclid=CjwKCAiArIH_BRB2EiwALfbH1J6ux7bpjt2P-B7qzUttsPdJZLrw8urDt2V4k1Nsei1QaMn4zIzdkBoCRroQAvD_BwE

In reply to Toyman01 (Moderately Supportive Dude) :

They're more or less non existent out my neck of the woods, I'd have to make a trip to a city and hope I get lucky.

I did a pretty good trawl of eBay and gumtree (Aussie Craigslist equivalent) before posting this to no real avail. 

But I had another look last night, searching for torque wrenches in the hope I might find a deflecting beam type wrench and managed to stumble upon a dial wrench for a good price, just hoping the seller gets back to me.

In reply to Vajingo :

That's not a bad idea, I'm sure I could get pretty damn close with a bit of measuring and math. It'd definitely be superior to the guesstimate and hope method.