I have a wheel which has serious damage in two places. First - there is a huge wobbly-wheel due to side collision (5mm) and second - there is a dent on a braking surface. I'm curious - is there any change to true this wheel? Rim is very strong, I'm not sure if I can bend it with my hands or body weight.
I guess you have an aluminium/aluminum rim, which doesn't take kindly to rebending. Steel is generally okay to bend, but I have no experience with CF wheel rims.
Tool for rim tweaks is Vice Grips - with layers of padding in the jaws. If you can find the ones with ~50mm wide clamping surface, that distributes the pressure better and reduces the localised "bottle lid" effect.
As for bending the whole rim back to approximately flat, lay a broomstick on a flat concrete floor, then stand on the high bits.
Kind-of like this but not using the axle, since its a bare rim you will want to overbend it so it ends up straight. Use the flat concrete floor and look for wobble.
If the wheel is this bad, its dead. Straightening this wheel is a get-home fix only Notice in the middle where the join has wrenched, and now the braking surfaces will have a lip? Also the whole join is stressed and may give way anytime.
Regardless, once you have your rim straight, examine it closely, both sides, for cracking. Spend at least 10 minutes on this and even use a loupe or magnifying glass on anything suspicious. Check in the braking surfaces, the spoke side, and in the tyre valley.
Alloy does not bend back very well, so you might be best off replacing the rim rather than rebuilding it.
Aside - don't misplace any spokes or nipples! On my 20 spoke shimano front wheel, the oversized nipples go at the hub and are $14 each to buy, and the spokes have to be hand made.