A flamer that arrives a minute earlier is a bad idea. I'd like to see the IR HT reworked but don't think this is it. Since OKW can't build caches, something that increases resources and maybe locks down areas would be good. Even something similar to an ambulance would be okay.
I've talked with Widerstreit (pretty good and well known modder on here, part of the Wikinger mod team now) and he said it's impossible to "fix" it.
That's pretty much the reason why nobody has touched it, because they simply can't, the unit's code is just bugged and requires a programmer from Relic to actually properly fix.
Also OKW already has the 223 that can lock down resource points so that's probably a no go on your 2nd idea as well.
But yeah a 250 could have an ambulance upgrade of some sort, I know the OKW 251 HT in the All Units mod has an ambulance upgrade that covers the entire top of the vehicle with the canvas and has a special skin for it as well with the medical red crosses, looks pretty nice if you ask me.