It's simple to drill the holes necessary to fit an electric starter. Unless someone's made some strange swap, your bell housing does have the boss that you can drill. You can do it with a hand-held electric drill and a hole saw from the hardware store. You might have to rest once or twice / take a break but it's not that hard to drill the big hole. Main critical factor is to ensure your holes are centered fairly accurately (e.g. within 1/ but even so, if you're out, you can file and wiggle some. Electric starter components are all available from various sources.