The phrase "arrange otherwise" is correct and usable in written English.
It can be used when indicating a need to organize or set things up in a different manner than what has been previously stated or assumed.
Example: "If the schedule does not work for you, please let me know so I can arrange otherwise."
Alternatives: "organize differently" or "set up in another way".
— Unless arranged otherwise, all incoming shipments of dried plants are frozen and processed by collections management staff prior to being routed to designated recipient.
The cumbersome, expensive visa-application process requires a letter of invitation (if you're traveling on your own, a Moscow hotel can often arrange one; otherwise, tour operators can do it).
Once the meaning is specified, it may well be that any sentence that has this meaning would be true even if, for example, the point masses of the universe were arranged quite otherwise than they in fact are.
This appointment is valid for the hospitalization time, unless the patient arranges it otherwise".
He was forbidden to speak to anyone except his lawyer on the grounds that he might otherwise arrange for the destruction of evidence.
Of course in almost the same breath she admits that to prepare for such events, she and her colleagues precut and otherwise arrange the materials in a way that makes the reuse incredibly easy, requiring little skill and even less creativity.
You can accompany your loved one to an event for seniors, arrange transportation or otherwise facilitate the process.
Either come home at lunch or otherwise arrange for someone to feed your dog in the middle of the day.
These representatives may relay a response, convey a written statement, arrange an interview or otherwise serve as go-betweens.
I was so shocked (not to mention amused) that I barely noticed the woman who, during a commercial, appeared to pat and otherwise better arrange a thin patch of hair on the back of Jennings' head.
