As someone else said - Base will allow you to finish - that is the key thing really so that is what I would chose.
Note you have been doing 200-250 TSS a week and you are now upping it to 450+ a week. That is quite a lot of work and you will feel much more tired than you have done previously.
You will also need to get outside at least once a week for 90 mins or more if the weather is suitable.