[HenryKissinger]

You can... the old fashioned way. Just bookmark a user's page and remind yourself to check it from time to time.

[DoctorOW]

I realize this probably isn't what Joewee was asking for but maybe RSS feeds are a compromise? Lower amount of work on the programming side while still being able to accomplish this feature.

[mooreds]

I post to Twitter for any of my hn posts using zapier and this:

https://edavis.github.io/hnrss/#user-feeds