Boring Bar Setup That I Can Use In My Mt#3 And My R8 Mills

Hello i am looking to get a boring bar that i could use on either my mills or on my Lathe.

i cant find any adapters that go from MT3 to R8, but i can find r8 to MT3 but they are very long and you lose alot of z axis travel.

Is there a setup that has changeable tapers?