I got 3 infernus marines, now what?

I got gifted 3 infernus marines for my birthday and i got them painted (yes i know ultrabois is oversaturated but i followed the instructions), but what do i do with them?

I at first wanted to see if i could have them be included in a 5 man squad but the infernus box comes a full 10 man squad, then i wanted to see if i could use them for kill team wich ive come to found out; no intercessor marines besides sargeants have anything remotely close to a flamer.

The only other option that comes to mind is to proxy them as eradicators but id like advice or counsel on what to do with them (everything will be appreciated).

I got gifted 3 infernus marines for my birthday and i got them painted (yes i know ultrabois is oversaturated but i followed the instructions), but what do i do with them?

I at first wanted to see if i could have them be included in a 5 man squad but the infernus box comes a full 10 man squad, then i wanted to see if i could use them for kill team wich ive come to found out; no intercessor marines besides sargeants have anything remotely close to a flamer.

The only other option that comes to mind is to proxy them as eradicators but id like advice or counsel on what to do with them (everything will be appreciated).