With quite some effort spread across some weeks, I finally keyed in Bhagavan Anandagiri's Tika on Mundaka Upanishad Shankarabhashyam. I'm sharing the same here in case someone finds its useful. I haven't seen it available anywhere online, except as part of some scanned books. However, the following is in unicode and can be copy pasted into your document editor directly. I've only proofread it myself, so please let me know if you find some errors.
ॐ तत् सत्॥
यदक्षरं परं ब्रह्म विद्यागम्यमतीरितम् । यस्मिञ्ज्ञाते भवेज्ज्ञातं सर्वं तत्स्यामसंशयम् ॥