Pwede kaya mag frankenstein setup ng new/old plt routers for bridge mode, kung possible man sa lumang unit na to?

bale F670L > PRS1841U (pictured, to be bridged if supported) > Archer C64 (main). Chinat gpt ko, looks like doable pero curious kung may nakagawa na. Pahirapan kasi sa area ko magpa setup ng bridge connection. Lagi na lang napupunta sa repair yung tickets ko regardless kung san platform ako mag inquire at kahit anong effort ko ielaborate yung request ko. I thought at least their twitter is better at gumawa pa ko ng account recenty only to discover na nirerelay lang din nila sa messenger lahat ng concerns. As of now di makapag DM sa cares account.
I have a pihole+unbound working pero hit and miss dahil double nat sa current unbridged setup (F670L > Archer C64)
Any other workaround? Or gamitin ko na lang as access point? I also have ASUS RT-N12+ as AP at the moment.