arcturus;
Preferred first option is always to replace 6V components with 12V, and many of these exist because later Volvo models also went to 12V. If you cannot locate, or have another reason for not changing to the 12V version, DRs are the second choice, and yes, one could be installed for the Wiper Motor (although removal from an Amazon does not require glass removal and is otherwise not unreasonable...I can't speak to level of difficulty removing Wiper Assy on 544).
For answers to other questions, I refer you back to the article and notes, including reports of first-hand experience.
Cheers
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