France can beat Ottos 1vs1 quite easily..while it's true that the otto troops are slightly better, France has better generals and more manpower
Ally some useful people and then declare the no cb, when the Surrender of Maine fires your allies will do all the work for you. If you are lucky they might even invade the Isles. You focus on the Ottos
Return Byzantiums cores and take something on the other side of the strait so you don't need a navy, from England you take British provinces if you control a fort (because a) it means you can move your troops before declaring and ignore naval warfare and b) you can take your cores in the second war with reconquest cb for less AE)
Improve relations with Wallachia, the Beyliks and whoever you piss off by taking stuff from Britain
Ally some useful people and then declare the no cb, when the Surrender of Maine fires your allies will do all the work for you. If you are lucky they might even invade the Isles. You focus on the Ottos
Return Byzantiums cores and take something on the other side of the strait so you don't need a navy, from England you take British provinces if you control a fort (because a) it means you can move your troops before declaring and ignore naval warfare and b) you can take your cores in the second war with reconquest cb for less AE)
Improve relations with Wallachia, the Beyliks and whoever you piss off by taking stuff from Britain