Yeh Ali's right Steve, there would be no compromise on sound quality if that's all that's stopping you.
The Y connectors are usually 2 into 1 leads.
You can get RCA splitters as well like this: https://www.ebay.co.uk/itm/Phono-Spl...8f6abd7abcfe61
Or better quality like this: https://www.ebay.co.uk/itm/PRO-RCA-R...8AAOSwgEhbetH9
Or you could fit another set of RCA sockets to your Pre.