Hi Mark,
I used 24nm on the bolts and used “Tef Gel” on the threads, as you are correct in as much as “electrolytic corrosion” is possible. I stay away from copper grease on assembly of dissimilar metals and use Tef Gel. Copper grease is excellent on many applications and it has a place on my garage shelf. I worked in the marine industry for many years and have seen aluminium turn to powder if the conditions are right (or wrong) so it’s a personal preference on whether to assemble dry or not. It’s also worth mentioning that you could over tighten if you use an anti seize compound, so again caution is always advised.
Sorry for being a little grey on this, but read as much information as you can and make your choice.
Cheers AJ