Regarding QQQE,

There is much to be said for doing it yourself rather than buying a fund. No management fees, to start with. Several brokers have one-button order entry from a list, and one-button rebalancing. But the main advantage is that you can eliminate a few firms if you so desire.

Or you could simply buy the top 10 or 20 or even 50 holdings of QQQ in equal weight.
The top 10 are 47.38% by weight.
Top 20 are 63.70%
Top 50 are 85.82%

The #50 stock is MRVL at 0.46%.

I change my mind about QQQ vs. QQQE (or QQEW) on alternate weeks, despite the attraction of equal weight vs. cap weight.
The backtests show QQQ has better CAGR than QQEW with slightly higher volatility and better MaxDD and better sortino.
testfol.io: Portfolio Backtester for ETFs and Asset Allocation

If you want to do a roll-your-own, M1finance.com is a good choice. Once you enter all the stocks, just one click buys or rebalances the portfolio. The limit is 100 stocks in a portfolio, so the entire QQQ holdings would fit.

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Oh. "One of my sons (27 YO) has some money he wants to get invested."

BRK.B is a great choice for a beginning investor.

"has some money" implies a small amount, undoubtedly less than $10,000. So a DIY method like Jim mentioned is probably not particularly feasible.