I had exactly the same dilemma some months ago while planning a two month trip.
Remember also that, unless you make partial shipments to home during your trip, you will have to carry all your films (or negatives) back to home. I came to the conclusion that the best way to assure you will have enough space (and weight allowance) to carry everything back to home is to carry from the beginning all the loaded cartridges you plan to use, then develop at home. Same size and weight that goes, comes back.
In terms of space, you will not save a lot carring bulk film cans. Each 100' can occupies a volume similar to 12 film cartridges, each can renders 18 36exp. rolls, so your gain would be the volume of six (18 minus 12) cartridges per each can. The bulk film loader has a volume equivalent to maybe 30 cartridges, so it will "eat" the volume gain of five 100' cans. (Let's assume that, at the beginning, you will carry the empty cartridges inside the bulk loader). In other words, five 100' film cans plus a bulk loader will use the same space as 90 individual film cartridges. If you plan to shoot no more than 90 36exp. rolls, then is more efficient to carry the preloaded cartridges.
My advice is that you carry all the film you will use in leaded bags, without the boxes and plastic cans. Carry some plastic cans to be used to protect the film during your day trips.
Moreover, develop and scan during your trip ? Possibly you will get better quality and price at home rather than abroad.
Carrying a bulk loader and film drums ? Remember security inspections at the airports, on a recent trip (in Europe) my case was opened twice by security services without me been present. No harm in my case, but bulk film cans look pretty suspicious.
Doesn't sound as a good idea to me.