the frames for MTB have proportionately long top tubes..
reach to the hoods is going to be quite far and nothing you have is transferrable
stem, brakes lever and cables.. shifters ..

Consider Trekking Bars: the figure 8 bend will have the added hand positions ,
but retain the gear and shiftlevers as the tubing remains 7/8" .. 22.2mm

bar clamp in the center, so side reach is the same, front further, back closer..

bull horn setups (below) are just further away and lower. IDK if any parts are reusable.