In my opinion this is a terrible idea for a number of reasons:
First and foremost it is probably illegal. I know that the 923MHz frequency you are after is for LORA use but the requirement there is to use approved circuits because...
Secondly this will almost certainly cause 'splatter' across a wide range of the spectrum, certainly around your centre frequency but also in other places across the spectrum which causes....
Thirdly you will generate interference which can attract the attention of the authorities - hnece why it is illegal (see the first point).
What is the original problem you are trying to solve that makes you think this is a solution?
If it is a LORA based application then there are many alternative approaches. If it is something else then we may be able to tell you a better way of achieving your goal.
Susan