Order a few meters of PTFE tubes 4 x 2.5mm then you can mount them wherever you want.
Can’t give a final recommendation for your variant. To go thrue a free spear hole of the Bambu Lab AMS Hub isn`t the best idear neither but it works. TPU stretches, the cross section also tapers. Then there can be problems with the exdruder - because it no longer works properly with a small diameter… but basically it’s up to you. Just go into the topic like this: After tighting comes loose. Whether it’s broken or loosened… who knows 
It depends on how far you’re already on the limits…Whoever dares wins and whoever never loses never learns anything and doesn’t get better and never will win anithing.
Check also this topic:
And bye the way, if there’s one less problem with TPU, it’s the lack of adhesion on the first layer… there are cheaper printers for that and it protects the X1C from unnecessary running hours… The Y joint - for me a thing of the past…