Preparing/stabilizing thresholds for HU

Hello! It’s about a 20-year-old vehicle, which is supposed to exist the HU the very last time. I worry about the sleepers. On both sides the sleepers have been welded before: with the one sleeper there was an accident damage, which was repaired. The other sleeper had at the last HU a place, which did not hold up to the screwdriver of the examiner. There was then a piece of sheet metal welded in there. There are several places that might not be able to withstand the tester’s screwdriver. There, the metal bends slightly easier when you press on it with your finger than in other places. I don’t know if rust is the cause of it. There are no visible rust holes. Now I’m thinking about how I can handle the vehicle’s failure. Even with the screwdriver trying to destroy everything, I don’t want to. do not simply make the sleepers on both sides (at least partially) blank and then simply for safety (must you still look where/how exactly) a thin sheet metal (must be somehow adjusted to the curved shape of the sleeper; alternatively buy complete vehicle-specific sleeper repair sheets and stick on to the old sleepers?) glued to the whole surface with body glue, then pull over spatula, a little grind and with underbody protection and/or spruce varnish in It’s all about the fact that the vehicle doesn’t fall through the HU due to rust. Unfortunately, I don’t have a welding machine and I don’t have much experience with it, so that the above-mentioned solution would be an idea. Alternatively, I had thought of metal spatula. Since the vehicle is certainly worth hardly more than 500 euros in the current condition and will also be thrown off in the foreseeable future. should the costs be kept as low as possible. I would actually like to work in front of the HU, as otherwise I certainly have to show correct spot welding for newly applied sheet metal. What is your advice? Thank you in advance for your help!