one way to get over objection of clients over original content may be to share with them case studies like dollar shave club ,etc . Usually when people see actual sales uptrends they care a little lesser about intangibles like brand reputation .
Also you may share with them that Content is the nature of the beast called social media , where “weird stuff” actually works.
It doesn’t really follow the old school rules of professionalism.
Also as a social media consumer , i don’t really care about brand “originality” , i care about the sentiment i felt when i saw it’s name , and that can be done amazingly by reposting with credits , trending content in niche. Kinda like trust borrowing.