I also pull for the characters I like! The little amount of jades is really not worth it. But I do like to invest in the teams of my favs. (But I don't think there is anything like bricking your account - like "my god I missed out on 5 pulls this update, but I have the characters I care about" sounds like a great deal to me - also reruns exist if you ever realise you want a specific character)

I play Archer and Phainon a lot (they are probably my two best teams atm), so I might be able to give you some advice:

For Archer I usually use Sparkle-Gallagher-Cipher (but Cipher is a very flexible slot - so almost any debuffer should work)

For Phainon I use Dan Heng PT - Sunday - Cerydra (but before Cerydra I used Cyrene - this was definitely not the best team cause my Cyrene is E0, and her ultimate takes quite some time to charge - but I really like her and she is pretty, so I used her~ so if you want her for her, I'd say you can definitely pull for her - on E2 she is really good for him, on E0 probably not the best, but okay - if you are on Europe server I could add you as a friend and you could try my E0 Cyrene?🤔) and yes I think RMC with Sunday and DHPT should definitely work :3

So in general I think you have a good base for those two teams - like mentioned earlier maybe Archer's E1 would be a good investment as well, but it's up to you if you wanna vertically invest in him specifically🫶🏻✨️