If your single engine class and flight review is not valid, it becomes more complex to convert.....in effect more money , its up to you.
All your flying will be with an instructor ticking boxes, when you meet the required standard you will be recommended for the skills test.
The path is just the same, either way , flight training as required and skills test.
My advice just pick a flight school , speak to head of training and they will sort it.
Just go for the EASA PPL .