T-terminals are reputably the weakest of all terminals, to the point that some manufacturers will not give a Safe Working Load. Having said that, there are thousands of them out there and very seldom is there a problem. The most common cause of breakage I think is a mis-match between the terminal and the backing plate; when doing a re-rig the new terminals are not always compatible with the existing plates.
All that to say, if you stay with swage T-terminals make sure that whoever does the job is aware of the pitfalls.
If you want to go swageless it is quite a lot of work to change the tangs in the mast
. When you remove the T-terminal backing plate you will be left with a fairly large hole in the mast; what to do about that, for a start?
Putting a through-mast tang (a bar that traverses the mast and has threads each end onto which you put your bits to accommodate eyes or toggles followed by locked nuts) is a good, solid way to go.
Or you could go for stemballs which need their special tangs, which in turn need large holes; they are stronger than the Ts.
Those are about the extent of your options.
Cruising boats usually have enough rigging
on a mast to hold it up twice ! You have that in your favour.
Just my 2 cents worth.