Sorry, no proven way to do this I know of. Victron definitely doesn’t make micro inverters like you are suggesting.
If you are asking also if you can connect the 150W and 250W together then the answer is likely “no”. I am guessing they are not the same voltage and therefore not compatible. The good news is you can definitely use two separate SmartSolar MPPT controllers and synchronize the charging on the same battery bank. Let me know if you have other questions.
I am not very familiar with the BM Pro. Generally speaking though I don’t recommend there being anything between the Solar panels and batteries but the MPPT and proper circuit protection. Ideally the solar charging system should be on its own with the exception of the negative side of the MPPT going to a shunt if installed.