[Ohayo Travel]

It may be an option:

Kawaguchiko Station –(Fuji Kyoko Bus)– JR Gotenba Station — (JR Train)–Matsuda Stn. –(walk 3 min.)–Shin-matsuda Stn. –(Odakyu Train) — Odawara Stn. –(Hakone Tozan Train)– Hakone Yumoto

Reference

https://bus.fujikyu.co.jp/pdf/rosen/gotemba/2022/timetable_2.pdf

https://bus.fujikyu.co.jp/rosen/detail/id/6/#d_h01

https://www.hyperdia.com/en/cgi/en/search.html?dep_node=GOTEMBA&arv_node=HAKONE-YUMOTO&via_node01=&via_node02=&via_node03=&year=2022&month=12&day=15&hour=17&minute=10&search_type=2&search_way=&transtime=undefined&sort=0&max_route=5&faretype=0&ship=off&lmlimit=null&search_target=route&facility=reserved&sum_target=7