I'll go ahead and just buy one UM2 upgrade kit, a Bondtech feeder, and an aluminum ring then. I already have an olsson block and a 35 watt heater so I think im pretty set up already.
Also to verify, in order to make this process easiest and most streamlined, it seems that it is best to use the Bondtech feeder as the primary feeder with the UM2+ hot end, and to use the UM2+ feeder with the old UM2 hot end as the secondary. Logic here being that the UM2+ feeder seems to be more simple to use as the secondary and I can thus use the "simple BOM". I would use