retrofitting '04 F15C (non-electric start) to charge boat battery?

I have a 2004 Yamaha F15MLHC (tiller sterring, non-electric start) outboard. It is used as a *****ing motor on a larger boat. I would like to find out if it is possible to convert this to charge the boat battery. This could be a potential life-saving feature.

When I purchased new, I remember the dealer telling me that it could be converted at a later date. I called the dealer this week and they said a kit is not available.

I may also use this on an aluminum fishing skiff at a later time (when I simplify my life) and battery charging would be needed and electric start would be handy.

Thanks

[boats.net]

There are no kits available. You can add a rectifier(6G8-81960-A1-00) to charge a battery but would require some wiring. You can buy all the individual parts to add elect start.
6G8-81960-A1-00 1 RECTIFIER & REGULATOR ASSY
6G8-82150-00-00 1 FUSE HOLDER ASSY
97095-06016-00 3 BOLT
92995-06600-00 3 WASHER
6G1-81952-00-00 1 HOLDER, RELAY
6G1-81941-10-00 1 STARTER RELAY ASSY
66M-82105-00-00 1 WIRE HARNESS
66M-82117-00-00 1 WIRE, LEAD
65W-8182B-00-00 1 NUT, SPECIAL
95380-08700-00 1 NUT
92990-08600-00 1 WASHER, PLATE
6H3-82540-00-00 1 NEUTRAL SWITCH ASSY
6J8-82554-00-00 1 STAY, NEUTRAL SWITCH
90109-06M86-00 2 BOLT
65W-81870-00-00 1 STARTING SWITCH ASSY
66M-81800-01-00 1 STARTING MOTOR ASSY
90119-08M39-00 1 BOLT, WITH WASHER
90109-08M78-00 1 BOLT
90109-08M85-00 1 BOLT

Thank you for your prompt answer to my question. The solution looks expensive, but at least it is possible.