Your combination of the separate step down transformer & US station will work. Cost wise however, you may be able to find an alternative for similar money that's a better performer.
Ersa iCon Nano would be worth a look IMHO, as it seems to be the best value of a new station in the UK & EU markets right now (newer tech than the RDS80 or Analog 60, but these are still worth considering at the right price on the used market). JBC would be really good to locate if possible (expensive new, but do come up used from time to time). Weller too (i.e. WS81 or WD1 w/ WP80 or WSP80 iron), but I'd look for Ersa and JBC first.