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Hello Stefan,
Your plan will work fine for a few Rivnuts, and to extend the life of your tool, use a fairly hard bolt (hex head 'Allen' bolts are often fairly hard and tough) and then use (or make) a nut that is longer than a regular nut. Then use some kind of an extreme pressure lubricant everywhere, like molybdenum grease or what you ever else you might have on hand. Ordinary grease or oil is much better than trying to do this 'dry' with no lubricant. Use several greased washers under the nut to act more like a ball bearing thrust washer, because the Rivnut will want to spin from you tightening the nut. You just hold the 'bolt' in place with one wrench at the top and tighten the nut to squeeze the Rivnut into place.
How long your homemade tool will last depends on what material your Rivnuts are made of, and how good your installation tool is.
Even the official 'store bought' Rivnut tools will have the hardened steel 'bolt' fail every so often, depending on which quality of Rivnuts you are using just because it is a very hard 'pull' to squeeze the Rivnut into place. It is very easy to over tighten the Rivnut and your tool, so it is good to do a test on a scrap piece first so you know what it feels like, and how many turns of the nut it takes to install your Rivnut? with your installation tool when the Rivnut is installed properly. It is easy to pull the threads out of the softer Rivnuts (such as aluminum) by over tightening the tool
YouTube has many videos about all of this too, so check them out for other variations of homemade simple Rivnut installation tools.
tom jobe...