The item stats are already decent. The problem is that it is mostly usefull for towerdiving. and we have Alistar for that and lets not forget all ways to reset tower aggro, hi Elise hi fizz hi zhonyas hi tahm.
On top of that towerdiving is usually done with a numbers advantage to guarantee safety.
The item is waaaaaay to niche its only usefull in even numbers towerdives where you can 1v1 or 2v2 or 3v3 the enemy team as long as the tower doesnt participate. But if that is the case then your advantage is not that big anyways and this makes it risky to go with even numbers, especially since they will see you coming so there isnt a surprise or catch out situation, and this allows sidestepping of skillshots giving the enemy the chance to turn things around.
If your advnatage is big enough to dive 3v3 without much risk then you wont really need the item.
The item fullfills a role where its only good in 1 situation thats when you are about even and want to do an imposible towerdive and remove the tower from the equation with the active. This only removes the enemy advantage of the tower and puts you right even making it still a risky move.
Then if you missplay and fall behind the item becomes useless as you cant fight the enemy directly anymore tower or not. Unless the enemy missplays but who builds items that become usefull only when the enemy missplays.
On the other hand if the dive is succesfull and you get ahead then the role this item fullfills also becomes useless as with your advantage you wont need it to towerdive.
Now finally there is also the matter that towers will fall over the coarse of a game making the passive obsolete.
On top of that as i explained item is useless when you fall behind aswell as when you are ahead because in both situations you wont be needing the active. Maybe sometimes when behind it can be usefull when diving with a numbers advantage but thats about it. when ahead it becomus utterly useless because not only will you not need it to dive you will probably be destroying their towers quite fast to snowball making the passive irrelvant afterwards.
My sugestion,
total price 3000
Give it 30 armor 30 mr 300 hp 200% health regen instead.
keep the point runner passive.
New passive omwrecker.
Allied tower gains splashdamage 175 radius, 25% attackspeed, deals true damage to minions for 8 seconds. 90 second cooldown, reduced by 5 seconds for every 150 damage the tower takes whilst the tower is powered up.
Now it becomes an anti siege item which gives a bit of durability and a decent amount of regen to resist poke aswell as having an active which helps clear a minion wave. If the enemy attacks the tower to take it but is unsuccesfull then your cooldown is shortened so you are able to use it again, if you manage to stall them for a bit, untill hey can push into you again.
However when you use the active the enemy can also backoff and decide not to atatck the tower and wait for the next minion wave, your active is still on cooldown and they shoudl take the tower.