A keeper actually mentioned Melbourne and Dubbo had planned it out to transfer Luk Chai across in time for Dokkoon's cycle. The timing gave Dokkoon the best opportunity to conceive rather than waiting another potential three to four months until she next conceived.
Dokkoon cycled less than a month following Luk Chai's arrival, with Num Oi and Mali doing so the following month. Mali, as has been mentioned, delivered Roi Yim a few weeks earlier than anticipated, as did Num Oi from memory.
I know Luk Chai was actually supposed to transfer earlier in the year too (around Autumn), but after covid hit, plans were significantly impacted, so Melbourne was really rushing to get Luk Chai across before any further restrictions were put into place (keep in mind, back then it was really unknown how the pandemic would still continue to unfold).
With that in mind, I do wonder whether the same could be done with Putra Mas/Pak Boon, ie. with Putra Mas's transfer lined up and timed to align with Pak Boon cycling following his arrival.