I got the LP53 from eBay via Germany to Australia and it took a little over a week to get here. I was happy about that and you have buyer protection. Just be mindful that due to your motherboard, you have to mount the fins perpendicular to your ram, so you wont get as good temps.
3 coolers I know of are this one from
@dondan which I was hoping would be sooner rather than later. Another secretive one from
@Kmpkt which should be due for reveal any week now, and a copper version of the C7.
As for the NH-L9I, the temps will be probably be the same as the C7 you have, just quieter. Given your options, I would personally do these things first: Undervolt CPU > Replace C7 fan with A9x14 > Delid CPU > Get the LP53.
Undervolting is free, but takes a bit of time and testing to get it right (I haven't done it myself). May as well get the fan first and replace yours to see if your happy with that, since you'd need it for the LP53 anyways. Delidding will void warranty so that's a personal preference, but should yield some good results.
Those should get you by until these new coolers come out, then you can get an even better one