good news, you don't need a stradivarius to play baroque cello! ;)
Almost all the celli of the baroque period have been transformed to modern set up (including neck, fingerboard, bass bar, sound post, bridge, and size for most of the instruments made before 1700).
Playing a 300 years old wood is not the most important knowing that the cellos in the baroque era were recently made of dry wood not 300 years old wood. An historical set up on a newly made instrument with baroque mesures is, to my opinion, the most authentic approach (and affordable for a musician!).
By comparing essays, paintings, one can get closer to what might have been the instrument 200, 300, or 400 years ago but what is also important to consider is that the human kind changed, the performer changed, the society and the developpment of the ego of the performer also changed. It is impossible to erase the present, nor the past but only be aware of it.