There is no limit to the number of RS gold times you can use it. Ardougne Cloak 4 could be replaced with either Ardougne Cloak 2 or 3 however, they can only be used with the Farm patch every day. You can also use Teleport to North Ardougne (must unlock at Livid Farm) but that is a long way away from the patch for farming.
Teleport to Catherby can be replaced by a Teleport to Camelot or a Camelot tab. The Trollheim Patch cannot be diseased/die. Magic Secateurs are optional but can increase Herb yield. At present, I'm not sure if it is worth using Juju Farming potions . While they're helpful however, they require a long time to gather ingredients to create. They do make Torstol seeds an alternative to make money, offering the average of a higher profit than Snapdragon even for patches other that Trollheim. Trollheim patch.
One thing to note in this article that covers the various options available, however I'm pretty much in agreement. When it comes to juju-farming potions go, they're good addition to any herb run. They give a 1 in 3 chance to collect 2 herbs at buy OSRS GP each time. I'm not able to do one with less than 50 herbs from 5 patches unless there's a death. My highest number is 70.