I get trustme's idea honestly its not a bad one but i think a m4+deag is a bit of a stretch, imo the most fair thing would be a default pistol (glock/usp) and maybe some kevlar? not a helmet tho. Running out of ammo on a JB round is completly unheard of to me. More bullets more thappy dumb players (which there are more than enough already).
Personally I don't usually care if they kill me afterwards, they did a good job to reach LR and that's the aim of the game for CTs: to get the Ts to LR. That's the downside of the suggestion I guess, LR would become a more CT controlled thing when it's supposed to be something that puts the Ts in a stronger position as a reward for surviving. You could place a gun in a hidden spot nearby and retrieve it if you win.