D610 upgrade to mirrorless

I have a Nikon D610 which I brought about 11 years ago. I have a number of lenses including primes (35mm 1.8, 50mm 1.4 and 85mm 1.8) and a 24 -70mm. I only use the primes and mainly use the 35mm for its versatility. My main reason for upgrading is a shift mirrorless for portability / less bulk and weight. However, it makes sense for me to keep using my old lenses (I think?) and, while I think I can do that with adapter, would the size and weight of the adapter negate the reduction in size / weight of the body? Any advice would be recommended. Also would the Z5 be the best model if I did decide to make the move?