I did the old modular route to CPL, finished 5 years ago. EFIS probably would be easier, but is it just screens displaying a normal ADI and RMI or full speed tape/altitude tape, map etc. If its full efis i would be careful, as most airlines still do sim checks on steam driven aircraft cos the sims are cheap.
When i was doing my IR the school was just getting Seminoles to replace Aztecs. Noone wanted to fly the seminoles because they were lighter and less complicated. According to school lore this apparantly made you less attractive to airlines! I just looked at the 3 grand it saved me and flew it. Save to say 500kgs doesnt stop a light twin being a light twin when the next aircraft i flew was 22t and definately didnt stop me getting a job! And having just jumped from 45t to 400t aeroplanes still do the same things with the same controls, they just get harder to park.
And having flown efis for 5 years i would struggle in a light twin.