You could simply get a LSI 9200-4e4i - the 4e is the 8088, that’ll go to your DAS. The 4i is the 8087, you could connect that to a SAS expander internally to get more HDDs connected internally. I’ve bought from jiawen2018 on eBay…like…at least 5 times, all good quality gear… eBay item # 142620883440 would be suitable (under USD$30). Just need a 8087-8087 cable to connect HBA to expander.
Did I read somewhere there are two work/office locations?