Personally, I would sell both and opt for the P2S. The QoL improvements are worth it. When I traded up, I had to choose between a P1S and A1, I kept the A1 specifically because of how easy it is to swap out nozzles. Anytime someone asked me in the past what I recommended for a first printer it was always the A1, with the P2S on the market I know recommend that model.
I think this is the best choice. The P2S is considerably better than the P1S, especially when it comes to QoL. A camera that actually works and good lights are something I never considered to be a big deal until I got the P2.
In this situation, they could easily pay for 90 percent of the P2S combo with the proceeds from selling both of those printers.
I would ditch the p1s, that little cursed LCD that can’t manage the AMS settings and filaments is a real drag [to me]. I like being able to set the filaments that I’ve just rearranged before I step away from the machine, and the p1s just can’t do it without yet another device.
I like my P1S printers, I like my A1 mini, I liked my A1 before the recall.
As I read your choices, I was, keep the P1S as it is England core x/y, then you need multiple colours and the convenience of filament backup, so keep the A1.
Then you threw in the best choice if you can achieve it.
P2S.
The day one quality issues appear to have been resolved and everybody raves.
Bambu said “the P1S model will continue to be manufactured and sold, and Bambu Lab has no plans to phase it out in the foreseeable future“. Parts for the p1s will be sold ‘till 2031.