Possible to force roaming on Vodafone 4g where 2Degrees doesn't have 4g?

Question, using a 2degrees SIM, is it possible to force a 4g device (in this case a 4g R216 modem) to roam on the Vodafone network, where Vodafone has 4g coverage but 2degrees only have 3g?

This is in Kinloch (Taupo) where Vodafone have 4g, but 2degress do not.

My preference is to use a prepay 2degrees SIM in the 4g modem (that can access data sharing from a pay monthly account), and use 4g speed (via vodafone).Instead of having to use a prepay vodafone SIM (e.g. pay and go), as vodafone doesn't have free data sharing from a paid account to a prepaid account.

Thanks

Edit: within the R216 modem management, I can set the "Preferred Network", either to Automatic, or to a list of connections (e.g. Vodafone, 2 degrees, Telecom).

So the modem part looks possible, the question is does 2degrees allow to force roaming on Vodafone 4g like this?