ᐅ New Construction: Internet and TV Connection and Wiring

Hello,
first, a brief summary of our current situation:

• currently still renting
• currently a customer of Telekom (internet + phone)
• already owner of an undeveloped plot of land (not yet connected to utilities)
• construction contract signed with general contractor, planned start of construction mid-March, guaranteed construction period ~ 6 months, so move-in expected around September, more likely October
• all electrical work included in the construction contract, no owner-provided work specified
• number of sockets, network outlets, etc., according to the construction contract very few, so we will need to add quite a few
• no basement

In our future place of residence (village), according to Telekom, only a "slow" DSL connection would be possible. Fortunately, last year Deutsche Glasfaser launched a so-called demand aggregation for the community, which was successful. Therefore, in the next few weeks/months, the village will be supplied with fiber optic cables.
I have already placed an order with Deutsche Glasfaser for our plot for internet ("DG Classic, 400Mbit/s") and TV (IPTV, which I understand means television over the internet cable) and thus save the connection fee of 750 EUR.

Now my question

• Upon inquiry, Deutsche Glasfaser told me that construction work in the community is planned to start in the coming weeks but will last a few months, so our connection will probably only be activated by the end of 2019 / beginning of 2020. If they are not ready by the time our other utilities (gas, water...) are connected to the house, they advise us to pre-install an empty conduit from the property boundary to the utility room as a preparatory measure.
What would be the best solution in the meantime? We will move in in September/October. Assuming DG’s construction takes longer than planned, we would be in our nice new house without TV/television/phone.

Should we first continue ordering internet/TV connections from Telekom during our construction? Our contract there is still valid anyway. Although the connection would cost about 800 EUR, I would get the later DG TV connection free of charge.