just a weird idea

but instead of playing around jg xp, why don't you just buff all camps HP, so enemy jungler will acutally be forced to spend more time cleaning them instead of just getting xp from lanes anyway.

Buffing camps HP will have more benefits to make jg less impactful than xp and there's 2 reasons why

1. They will need more times to clean them, so the laners have more time to do their things
2. Unless they are lee sin and have a perma shield/lifesteal they may get some damage early from camps, because ofc more hp on camps means they will also land more attack so there will have to either gank with their lifebar around 60-70% or smth depend on the acutal hp buffs or to recall giving either a chance to laners to fight back or again giving them more time in early game to farm or be aggresive.