I got tired of waiting on L-Twoo or Sensah to release their hydraulic groupset and ordered a take off Shimano 105 11 speed groupset today for a steal.     

There's also a Dub version. Not sure if that works with your set up. Some prefer the beefier spindle.
Can anyone confirm if that 24mm spindle is aluminum or steel?

https://www.aliexpress.us/item/3256804555867240.html?spm=a2g0o.productlist.0.0.726844dajJ6APX&algo_pvid=9fdd0ae4-04d7-4087-a99c-fe3f6c98c374&algo_exp_id=9fdd0ae4-04d7-4087-a99c-fe3f6c98c374-4&pdp_ext_f=%7B%22sku_id%22%3A%2212000030308680675%22%7D&pdp_npi=2%40dis%21USD%21190.0%2195.0%21%21%21%21%21%40210318c216687221119752371e9d27%2112000030308680675%21sea&curPageLogUid=7etN3wnPfraC

The lever / master cylinder / hose connection is what concerns me ... If it's good and reliable then likely little problem using a third party caliper, as you say.   But if it's poor or finicky, and I expect the first attempts to be really poor, then what's the point?  Could be totally wrong and some of them knock it out of the park on the first try ... We'll see.  Either way I'll be quite happy to leave behind €1500-5000 groupsets.

Re: Sensah I've no idea what their funding situation is.  But their strategy so far has clearly been stack them high and sell them cheap.  There's definitely money behind a couple of other Chinese companies working on electronic.