Typically I don't read many switch BL. I like it when you know which is the bottom and which is the top. Or I really like power bottoms but the author really did a great job with this story that I don't mind them being switches.
Now that you say that I think you're actually right.Σ(  ̄□ ̄||) There really aren't many switch BL.I feel like it's also because many artist draw characters that only look like they Top and ones that only look like they bottom. Or maybe that they don't explore the switch genre as much even though it's common in RL LGBTQ couples.
HMMMMMM... that's definitely a genre manga artist should expand more into since it's missing within the BL genre. ヾ(☆▽☆)
there was a mention for switch recommendations ( not a 1 time switch)... I dont's have many, BUT
https://www.mangago.zone/read-manga/satou_kun_ni_wa_kanawanai_sachimo/
(ONE SHOT- def should of been longer)
https://www.mangago.zone/read-manga/good_work_watase_san/
(complete: domverse)
ps: if you want to find more reversible pairs- look up "seke" in tags
Idk why but something about their love feels poetic. ( ̄∇ ̄")