Hydraulic disc brake - lever compatibility I purchased a gravel bike with drop handlebars, mostly for commuting and maybe for some weekend bike camping trips.  I've only ever ridden mountain bikes with flat bars in the past, but I figured I'd get used to the drop bars.  After a month I'm realizing that drop bars are just not for me.  So I want to take my Jones Loop off of my MTB and put it on the new gravel bike.

The gravel bike had Micro Shift MTB bar end shifters so I picked up the matching flat bar adaptors for $40 and that will be a real easy 10 minute switch.  Now I just need brake levers but I can't seem to find definitive answers online about which ones will be compatible with my brakes.

I've never bled a brake line before but I'm confident that I could do it and its only another $20 for the line bleeding kit.  More than one blog says that there are not many compatibility issues with hydraulic levers when switching from drop bar to flat, but I can't find anything that says if I can just use any random hydraulic levers with these brakes.

The brakes on the bike are TRP Hylex hydraulic disc brakes.  From what I can tell, TRP only makes one flat bar hydraulic disc brake set and they don't seem to sell replacement levers.  

I don't need top of the line parts, but I don't want to buy something that is going to break easily.  I found a store selling what look like very basic levers, Shimano BL-MT200, at $15 for the set.  I also found a list of other Shimano levers at varying price points, BL-M6000, BL-M7100, and BL-M8000.

My questions are:


Can I just swap out the TRP Hylex drop bar levers for these cheap Shimano levers?
Could I hypothetically use just about any random hydraulic levers? SRAM / Tektro / Shimano
Does it make good sense (would I notice a difference) to buy a more expensive lever like the BL-M8000?
An important reason why you can't randomly mix and match hydraulic brake parts is because different manufacturers use different hydraulic fluids. SRAM uses DOT 5.1 brake fluid. Shimano uses mineral oil. Campagnolo uses mineral oil. Using the wrong kind of fluid can damage the seals.