In theory it would work. But your right about your bandwidth. I'm not sure how much it would slow down just between the first two or three connections.
My wife uses her mac book connected to her iPhone using the lightening cable plugged into the mac book USB port. Works pretty good she says
We don't have that many devices in our RV just a smart tv and our iPads and the mac book for her college work.
We are actually liking at
https://www.amazon.com/dp/B01LZMZZT9/ref=wl_it_dp_o_pC_S_ttl?_encoding=UTF8&colid=3GZ0DOGR2N1U5&coliid=I1UUKXFT2RP4TU
But we don't use much wifi. Got kicked off once because our kids tried to stream movies through Netflix in a park.
Now we just use our phones. But for email and stuff we try to use theirs.