(still) Looking for hardtail frame for Bafang M620/Ultra

Still haven't found a frame. I caught a great deal on an new M620. Thought I would just keep it as a backup for my QK Ibex, but decided I want a hardtail bike for touring. (Plus it's 52V and the Ibex runs on 48V.)

But literally the only m620/Ultra hardtail frames I can find are:

Either from Alibaba and I can't seem to get any of those sellers to ship me a 'sample'
OR,
A titanium frame which will cost over $1000 shipped, frame only.

Part of my problem with FS frames is that the rear shock typically invades the space where I'd like to put a big triangle battery. But I'll also need to have a rear rack and panniers, and those options are very limited for FS bikes.

At this point I'd purchase a used hardtail frame which will mount this motor.

Any other leads?

Other questions:

No way to mount that motor on an M600 (or other Bafang mid-drive) frame without cutting and welding, right?

Am I incorrect in believing that a carbon frame will be less durable than a metal (aluminum/titanium/alloy) frame?

theres plenty on ebay

I know nothing about the motor or frame compatibility, but $1000 for a titanium frame sounds reasonable.

Carbon frames are typically durable for riding, just not for crashing or otherwise abusing. Still, wouldn’t be my frame material of choice for touring. Accidents happen. And airline baggage handlers are brutal.

The number of shops that can competently repair a titanium frame is very, very, very limited.

Considering the extreme measures needed to manufacture a Ti frame, I wouldn't trust China especially since a friend broke a BD one made in China (They denied his warranty claim).

There are titanium frames, and there are titanium frames. They became popular in the early nineties because at the end of the cold war, there were lots of aircraft manufacturers who had facilities for Ti fabrication and no work.

I'd be very reluctant to risk a lot of money on an Aliexpress ti frame - it is hard material to work with.