It's not going to line up with most track hubs. Your choices on a HT2 road double with a 1/8" ring end up being about 39mm inner and 48mm outer. The latter works well with a 6-bolt sprocket on a modified Boost (110×15) front wheel. You end up needing a lathe to move most common track hubs sideways, so the MTB hub option is no more trouble.
This all sounds far too complicated and time consuming, haha. If I can't make it work I might just have to buy a whole new crankset. The build of this £80 frameset is starting to look quite expensive!
I had a 1/8" chainring mounted on the outer position of a HT2 set of cranks, possibly a small spacer behind the rear sprocket and never encountered any problems.
It's not going to line up with most track hubs. Your choices on a HT2 road double with a 1/8" ring end up being about 39mm inner and 48mm outer. The latter works well with a 6-bolt sprocket on a modified Boost (110×15) front wheel. You end up needing a lathe to move most common track hubs sideways, so the MTB hub option is no more trouble.