smilinganddialing

So I think we're ready to do our first AoR (spouse will do this as I am going to stay app-free for a while to prepare for a mortgage app) and wanted to give some background and get your advice if this is the right strategy.

Primary Goal
1. International air travel (for 2) for fun and to attend weddings - expect to do at least 1x/year wedding in Asia and likely 1x/year in Europe and would like to travel to South America for fun

Current Points/Miles
1. UR - 100K+
2. UA - 150K
3. AA - 30K

Current Primary Cards
1. Chase Freedom - for everything under $20 and bonus categories
2. Chase United Club

Current AoR Strategy
1. Chase BA Avios - just aim for 50,000 Avios and don't put additional spend on the card after hitting the $1,000 spending requirement
2. Chase United Mileage Plus Explorer - still no miles from BCKSTGR so might drop this if I can't get the 55K offer
3. Citi AA Personal Visa - 50K after $2,500 spend offer (two browser trick)
4. Citi AA Personal AMEX - 40K after $2,000 spend offer (two browser trick)

AoR Strategy Questions
1. Would it be better to get Chase Sapphire Preferred instead of Chase BA Avios and just strategically transfer to Avios when we need to do a short domestic redemption on AA metal?
2. Would it be better to get Chase SP anyway to make it the primary spend card?
3. Any other thoughts or recommendations?

Thanks!