Hi
Have you looked at Everest from Edu365? (https://www.edu365group.com/)
Its a web front end for SIMS that offers much more value thank EduLink as its a fully functioning parent portal too.
I worked with these guys when I was MIS Manager at Dulwich College International group. We replaced Edulink One with Everest and the and the feedback from staff was extremely positive therefore I can highly recommend them. Yhey are very accommodating and offer a fab product with excellent support, half of their team are ex-Capita employees so they know SIMS inside and out and the other half are SharePoint experts giving Everest a professional familiar look and feel with some great integrations to O365 and a full set of PowerBI dashboards. If my schools were set on using SIMS I would certainly be having a conversation with them to fill the gaps.
Check it out and please feel free to contact me for further information.
Lee
