Clio 4 TCE 90 engine damage – What to do?

Recently my Clio has remained on the highway, diagnosis engine damage (control chain has solved itself and done some damage to cylinders etc.). To the car itself, Clio IV TCe90, 02/2013, 135t km run, bought it in August 21 from 1st hand for 6400€, very good condition and up to then (100t KM) checkbook maintained. A overhauled engine etc makes no economic sense, there is nothing less than 4000€. So only a used engine with possible prices are probably around 2000€ for the engine plus approx. 1000€ for the installation, according to my workshop. Only the problem here seems to be the availability of the engines. The workshop of my trust looks already about 2 weeks and so far nothing has come out of it. Many engines from abroad which categorically excludes my workshop. Here and there is an engine available but then they have already run 60-100t KM. Here is then eb In the private market I have not yet looked around, at least I had an offer of 3000€ including collection directly from the farm. So as far as the starting situation is concerned! At first I naturally tended to the first one, because I know at least exactly how it is with my car etc, so you don’t almost buy the cat in the bag. In addition, I will probably have to take about €7-8t in my hand to get another car that is at least comparable to mine on paper. However, I finally got into the pondering, an engine with 65t kilometers is also not so young anymore. I know myself with cars and repairs etc little, but only knows that I have had rather bad luck so far. So it happens to me at least when I see some 20 years old car on the road while my dead is standing around…… Long speech, ku Rzer Sinn, what are your recommendations? Is a used engine worth it? Or is that nonsense with these details? Especially with the background that I need a car. Currently I have one of the workshop but this is a small smart in minimum equipment, so nothing permanent. In other words, months wait until maybe an engine appears online that satisfies my workshop, I don’t have either.