i use my 1050 daily for digital audio switching,(some converted to analog at $$$$$).the 1050 is lacking at coax inputs...although,i see no reason a 'y' would not do what you want it to do.
i personally would not do it,but,it would work.(personal setup)

BTW---i love my 1050, like my best(beer..LOL)compare....the integra was a 2-channel pre,with 2 amps,2 eq's,2 pr.speakers,3bx wuz cool.90's('bout 1800 watts,total.)
i'll get a scanup soon.

that can not compare to the SQ of this system