are you sure your triggers do not have to go deeper , can go deeper or can be adjusted so as to go deeper .
thats what i would consider first . IOf the answer is no , then i would consider the following as opptions
1)_ As you said , you could cut off the Trigger plate . But that’s going to leave a hole . You could fill that hole. If you do a good job of matching the grain , only you will know .
2)_ you could file down the front of the trigger plate . But then if you did that your still going to have a step down below the wood , at the corners of your trigger guard. Which IMO would look worse then if you cut the end of the trigger plate off and then did a patch
3)_ trim down the Trigger guard in the area around the post . That way you can inlet the forward final of the TG ,a little deeper. Yet have the back step up onto the Trigger plate and still have the post drop through the hole
4)_ Scribe around the TG so that you can take your Jewelers saw and carefully trim the area out so that the TG can drop down through the trigger Plate .
5)_ cut the post off and silver solder it on at a point just forward of the Trigger plate . then file down the old location so that it steps up onto the trigger plate .
Frankly it all depends on the amount of work and how well you think you can accomplish that work . Frankly with what you have done so far , I honestly don’t think you would have a problem doing any of the above .
Now myself I would look back at your entry thimble . How deep have you inlet the final on that .
That depth is going to pretty much dictate the belly plain on your rifle . As such the forward final on your TG needs to be real close to the same depth . So looking back at your photos that you have posted , it would appear that you inlet the entry so it was pretty much flush with the existing belly of the stock .
Did you check to make sure your RR will fit through and into the stock properly ?
If you did and all was well , then it would appear that the existing plain of the belly of the stock is what your shooting for .
Normally the forward finals of the TG are not inlet to deep . Just to a point that the wood hits the side of the bevel ..
So taking that into consideration , I would most likely do #3 or #5 .
Between those two , at the point your at , I would probably go for #3 . If I had not yet cut the hole in the trigger plate and inlet the wood for the post , I would have went for #5