Robotz In Disguise's RiDiverse can be made to do herblore, and I've heard of a lot of people using it for 99. You can also do it in Soul Wars and not get any randoms. I've yet to hear of a ban from RiDiverse, so I'd say it's definitely your safest approach.
It is possible to minimize RiD, and credits are at ~8 cents an hour, which you can use on any of the 11 bots at RiD, so it's much more of a fair deal than others realize.
