I called in at LCE yesterday and the
Lowe Pro ADVENTURA SH 110 II may be an option. The X-T2 fitted, but the 18-55 lens was too long - however this will only be used with the 23mm f2 lens, which is a few cm shorter. The internal dimensions are 17 x 7.2 x 8.5 cm, which I would have expected to be too small for the X-T2.
I'll have to try again when I have bought the lens.