Use what you got. I have the same vac brand and started using it with a Bosch hose which has a 27mm end, but is a 35mm hose. Yes the Festool hose will plug straight in as the vac ends are pretty standardized. Eventually the filter will plug and need to be cleaned but it will get you started. A Dust Deputy helps remove most of the dust before getting into the vac, but throwing money at a basic vac doesn't make much sense (From someone who did just that). OR you can buy a Festool dust collector that comes WITH the right hose, but that comes at a much higher cost.
This hose is cheap and ready to go! BUT it is not anti-static, although I used one for over a year with no issues. "Bosch VAC005"
By the time you buy both replacement Festool ends and the hose you might have well bought the superior Festool hose, but this hose is anti-static. "BOSCH VAC008" I am not sure of the part numbers needed for the Festool parts.
I will say one of the best reasons I love my Festool vac over the SUPER LOUD Vacmaster is well I hate loud noises. Vacmaster is a powerful vac though.
Edit: Oh Festool allows the suction to be reduced which is good when sanding but you can create a hole in the hose system easily enough.