The main purpose for your "entering strategy" is to put a "hook" on your opponent. after that, you can play your striking game or grappling game however you want to play.
If your opponent refuses to block your punches, that hook will be very hard to put on him. Your hand may come back empty. In order to solve this problem, your striking hand have to change into a grab.
In the LHPM system, there is a drill called "catch grasshopper". It's very similiar to XingYi Pi Chuan.
1. A right hand big circle strike will turn into a right hand small circle grab.
2. A right hand small circle grab will follow by a left hand big circle strike.
3. A left hand big circle strike will turn into a left hand small circle grab.
4. A left hand small circle grab will follow by a right hand big circle strike.
5. go back to step 1 and continue like this forever.
If you train this drill, you will develop a habit that "the hand won't come back empty". If you miss the punch, you always change your punch into a grab and pull something back. This is very different from the pure striking art boxing principle.