/SLAMS IN HERE THREE DAYS LATE but yes, oh my god, I would be so up for that?? Considering Syaoran canonically falls for bullshit like this in canon, he's not about to question Ruby if she tells him he needs to put a cute drawing in his Blessings Basket or something equally as weird

But also ALSO YES, maybe one of them seeing it from another perspective might be like 'oh, that's actually a pretty bad idea'... or they might just feed each other's cycles of I MUST DO DUMB SHIT FOR THE ONES I LOVE-- either way, I'm good with however that takes shape! (And I am 100% good with them being sparring/training buddies too, give him new kinds of weapons to learn how to defend himself against)